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: Medicine
[{'content': 'A 60 years old chronic smoker presents with complaints of hemoptysis. Her chest X-ray appears to be normal. What is the next best investigation: \nSelect and explain. \nA. Bronchoscopy, B. High resolution CT, C. Sputum cytology, D. Pulmonary function test', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Answer is A (Bronchoscopy) : The patient presents a case of hemoptysis with normal X-ray but with risk factors for cancer (Age and history of smoking). Bronchoscopy together with a bronchial or transbronchial biopy is the investigation of choice as indicated in the following algorithm from harrisons text. Algorithm in Harrisons 16th/208 does not elaborate the distinction between bronchoscopy and HC and thus reference to previous editions is recommended.', 'role': 'assistant'}]