Preventing waterborne infections via food and water hygiene

Steps:

• Identify the advice focuses on safe food preparation, peeling produce, boiling water, and handwashing to avoid contamination.
• Recognize these target pathogens spread through fecal-oral route in unclean water or food.
• Match to diseases: cholera fits as it's transmitted via contaminated water/food; others spread differently.
• Confirm by elimination: advice doesn't address vectors like mosquitoes or airborne transmission.

Why A is correct:

• Cholera is caused by Vibrio cholerae bacteria, spread through ingestion of water or food contaminated with fecal matter, which boiling, cooking, and hygiene directly prevent per WHO guidelines.

Why the others are wrong:

• B. Malaria is mosquito-borne, not prevented by food/water hygiene.
• C. Measles spreads via respiratory droplets; hygiene doesn't target airborne viruses.
• D. Tuberculosis transmits through airborne bacteria from coughs, unaffected by these measures.

Final answer: A