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 60-year-old man with suspected bronchogenic carcinoma. TB has been ruled out in this patient. Investigation to be done in this patient is: \nSelect and explain. \nA. CT guided FNAC, B. Bronchoscopy and biopsy, C. Sputum cytology, D. Chest X-ray', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. Bronchoscopy and biopsy', 'role': 'assistant'}]