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: Radiology
[{'content': 'A chronic smoker presents with complaints of haemoptysis. 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. Bronchoalveolar lavage', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. Bronchoscopy', 'role': 'assistant'}]