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': 'As per RNTCP Cat-1, should receive-a) 4 drugs for 2 months and two drugs for 4 monthsb) 3 drugs for two months and 2 drugs for four monthsc) Includes Retreatment casesd) Rx is given dailye) Directly observed \nSelect and explain. \nA. a, B. b, C. ae, D. ad', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]