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': 'Most common lung cancer due to tobacco \nSelect and explain. \nA. Adenocarcinoma, B. Squamous cell carcinoma, C. LCC, D. IMAC', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]