Correct option is A
Sol. Measles is a highly contagious airborne viral infection transmitted via respiratory droplets, not by the faeco-oral route. It spreads when an infected person coughs or sneezes and another person inhales the virus particles. On the other hand, diseases like cholera, hepatitis A, and enteric fever are primarily transmitted through ingestion of food or water contaminated with fecal matter. Therefore, measles is the exception in this group.
Explanation of each option:
· (a) Measles – Correct. It spreads via respiratory droplets and direct contact, not through contaminated food or water.
· (b) Cholera – Incorrect. Caused by Vibrio cholerae, cholera is a classic faeco-oral disease, usually spread via unsafe drinking water.
· (c) Hepatitis A – Incorrect. It is a water-borne viral disease, transmitted through ingestion of fecally contaminated food or water.
· (d) Enteric fever – Incorrect. Also known as typhoid, it spreads through the faeco-oral route via Salmonella typhi bacteria in unclean food or water.