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': 'The sputum examination under TP is done when the patient present with -a) Cough of 1-2 weeks durationb) Persistent cough of 1-2 weeks durationc) Hemoptysisd) Chest paine) Intermittent fever \nSelect and explain. \nA. ab, B. bc, C. bd, D. cd', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]