Correct Answer: Clean Hands – Why Hand Hygiene Matters for Health and Safety

Introduction
In everyday life and professional settings, one simple yet powerful act can drastically reduce the spread of illness: washing your hands. The correct answer to maintaining public health is clean hands. Regular and thorough hand hygiene is not just a routine—it’s a critical defense against germs, viruses, and bacteria that can cause infections. In this comprehensive guide, we explore why clean hands are essential, how to wash them correctly, and how consistent hand hygiene protects individuals and communities.

Understanding the Context

Why Clean Hands Are Crucial

Hands come into contact with countless surfaces throughout the day—door handles, keyboards, shopping carts, and more—making them prime carriers of pathogens. According to the Centers for Disease Control and Prevention (CDC), handwashing is one of the most effective ways to prevent respiratory infections, stomach illnesses, and the spread of diseases like flu and COVID-19.

Keeping hands clean breaks the chain of infection, protecting both yourself and others. Healthcare workers, teachers, food handlers, and families benefit immensely from maintaining clean hands at all times.

Correct Answer: E Clean hands

Key Insights

The Correct Way to Wash Hands

Follow these simple steps to ensure your hands are truly clean:

  1. Wet hands with clean, running water (warm or cold).
  2. Apply enough soap to cover all hand surfaces.
  3. Lather well by rubbing your hands together—don’t forget backs, between fingers, and under nails for at least 20 seconds.
  4. Scrub for the full duration—sing the “Happy Birthday” song twice as a helpful timer.
  5. Rinse thoroughly under clean, running water.
  6. Dry hands completely with a clean towel or air dryer—moist hands spread germs more easily.

Proper handwashing removes dirt, bacteria, and viruses more effectively than hand sanitizer—especially when hands are visibly dirty.

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D) False — area is $ \frac{1}{2}ab $, and $ r s = r \cdot \frac{a+b+c}{2} $, and $ r = \frac{a+b-c}{2} $, so $ r s = \frac{a+b-c}{2} \cdot \frac{a+b+c}{2} = \frac{(a+b)^2 - c^2}{4} = \frac{a^2 + 2ab + b^2 - c^2}{4} $. Since $ c^2 = a^2 + b^2 $, this becomes $ \frac{2ab}{4} = \frac{ab}{2} $ — yes.
E) $ r s = \frac{ab}{2} $ — true
But best choice:

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Final Thoughts

When Should You Wash Your Hands?

The World Health Organization (WHO) identifies key moments to wash hands:

  • After coughing or sneezing
  • Before eating or preparing food
  • After using the restroom
  • After touching animals or trash
  • Before and after caring for someone sick
  • After blowing your nose, coughing, or sneezing
  • After handling garbage,公共设施, or public transport

Adopting this habit builds a strong layer of protection against everyday health risks.

When Hand Sanitizer Is Appropriate

While not a substitute for soap and water, hand sanitizer with at least 60% alcohol is effective when hands aren’t visibly dirty. It quickly reduces germs and is a convenient alternative when water isn’t available. However, sanitizer works best on clean hands—always clean before applying for maximum effectiveness.

Clean Hands in Every Setting

  • Healthcare: Critical in hospitals and clinics to prevent healthcare-associated infections.
  • Schools: Helps protect children and staff from spreading illnesses.
  • Food Service: Essential in kitchens and dining areas to ensure food safety.
  • Workplaces: Promotes a healthier environment and reduces absenteeism.
  • Home Life: A simple habit that safeguards families, especially during cold and flu seasons.