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': 'One of the following condition is not associated with clubbing - \nSelect and explain. \nA. Primary biliary cirrhosis, B. Chronic bronchitis, C. Cryptogenic fibrosing alveolitis, D. Central bronchiectasis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]