This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Communicable diseases, Subject name: Social & Preventive Medicine
Best emergency sanitary measure to control cholera is - 
Select and explain. 
A. Disinfection of stool, B. Mass vaccination, C. Provison of chlorinated water, D. Chemoprophylaxis
C: Provison of chlorinated water
Answer: C: Provison of chlorinated water 
Explanation: In cholera, as an emergency measure, in urban areas, properly treated drinking water containing free residual chlorine should be made available to all families; this water should be stored in the household in narrow-mouthed, covered containers. Ref: PARK&;S TEXTBOOK OF PREVENTIVE AND SOCIAL MEDICINE 23rd edition , Page 233