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
[{'content': 'How many doses of vitamin A are required to treat deficiency ? \nSelect and explain. \nA. 1, B. 2, C. 3, D. 4', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., 3", 'role': 'assistant'}]