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': 'Commonest type of lung carcinoma in nonsmokers is \nSelect and explain. \nA. Squamous cell carcinoma, B. Adenocarcinoma, C. Alveolar cell carcinoma, D. Small cell carcinoma', 'role': 'user'}, {'content': "Answer: B \nExplanation: Answer is B (Adenocarcinoma): `The most common lung carcinoma arising in life time non smokers in Adenocarcinoma'-", 'role': 'assistant'}]