This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Communicable Diseases, Subject name: Social & Preventive Medicine
[{'content': 'Best method to find out cases of TB in a community is:- \nSelect and explain. \nA. Chest X-ray, B. Mantoux test, C. Sputum smear examination, D. Sputum culture sensitivity', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. is \'c\' ie Sputum smear examination Park writes - "sputum smear examination by direct microscopy is now considered the method of choice. The reliability cheapness and ease of direct microscopic examination has made it number one case - finding method all over the world."', 'role': 'assistant'}]