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 and haemoptysis for 4 weeks; He has grade III clubbing, and a lesion in the apical lobe on x ray. 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: Answer is B (non small cell carcinoma): Presence of non productive cough, haemoptysis, clubbing and an apical lobe lesion in a sixty year old male suggests a diagnosis of carcinoma lung. Association with clubbing and a peripheral location lead us to a diagnosis of non small cell variant. Most common histological variant associated with clubbing : non small cell carcinoma Most common histological variant presenting at peripheral location : non small cell carcinoma Tuberculosis although, may present with such symptomatology, the age of the patient and non productive nature of cough go against its diagnosis.', 'role': 'assistant'}]