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: Pathology
[{'content': 'Most common histological subtype of lung cancer associated with pancoast tumor? \nSelect and explain. \nA. Small cell cancer, B. Squamous cell cancer, C. Adenocarcinoma, D. Carcinoid tumor', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]