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': 'Cavity formation in bronchogenic carcinoma occurs in \nSelect and explain. \nA. Oat cell carcinoma, B. Squamous cell carcinoma, C. Adenocarcinoma, D. Bronchoalveolar', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]