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': '1 mL of expectoration contains what number of TB bacilli in an active case of TB? \nSelect and explain. \nA. 100, B. 1,000, C. 10,000, D. 1,00,000', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]