This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Microbiology
Most impoant step in cholera control: 
Select and explain. 
A. Chemoprophylaxis, B. Vaccination, C. Early treatment, D. Water sanitation
D: Water sanitation
Answer: D: Water sanitation 
Explanation: Ans. is. 'd' i. e., Water sanitation