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': 'Clubbing is least common in: \nSelect and explain. \nA. Squamous cell carcinoma, B. Adenocarcinoma, C. Small cell carcinoma of lung, D. Mesothelioma', 'role': 'user'}, {'content': "Answer: C \nExplanation: Answer is C (Small cell Ca of Lung): `Skeletal connective tissue syndromes including clubbing is usually seen in no n small cell carcinomas 'H-1 6th Clubbing is thus least common with small cell carcinoma of lung", 'role': 'assistant'}]