This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory system, Subject name: Anatomy
[{'content': 'Clubbing is the least common in \nSelect and explain. \nA. Squamous cell carcinoma, B. Small cell carcinoma, C. Adenocarcinoma, D. Mesothelioma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Skeletal connective tissue syndrome including clubbing is usually not seen in small cell carcinoma. Ref Harrison 19th edition pg 250', 'role': 'assistant'}]