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': 'A 60 year old man presents with non productive cough for 4 weeks: He has grade I clubbing, and a lesion in the apical lobe on xray. Most likely diagnosis here is - \nSelect and explain. \nA. Small cell ca, B. Non small cell ca, C. Fungal infection, D. Tuberculosis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]