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: Sputum smear examination by direct microscopy is now considered as the method of choice for case finding. The reliability, cheapness and ease of direct microscopic examination has made it number one case-finding method all over the world . It enables us to discover the epidemiologically most impoant cases of pulmonary tuberculosis , ie; those excreting tubercle bacilli in their sputum . Ref: PARK&;S TEXTBOOK OF PREVENTIVE AND SOCIAL MEDICINE 23rd edition , Page :182', 'role': 'assistant'}]