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: Social & Preventive Medicine
How many doses of vitamin A are required to treat deficiency ? 
Select and explain. 
A. 1, B. 2, C. 3, D. 4
C: 3
Answer: C: 3 
Explanation: Ans. is 'c' i.e., 3