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': 'True about tuberculosis \nSelect and explain. \nA. >104 bacilli are required in sputum for detection, B. Mantoux test can differentiate between BCG and infection, C. Can be grown on ordinary culture media, D. Drug sensitivity is tested by schick test', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]