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: Surgery
[{'content': 'Blood stained sputum may be the only symptom in- \nSelect and explain. \nA. Bronchiectasis, B. Carcinoma bronchus, C. Adenoma bronchus, D. Pulmonary T.B.', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]