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: Medicine
[{'content': 'One of the following condition Is not associated with clubbing \nSelect and explain. \nA. Primary biliary cirrhosis, B. Chronic bronchitis, C. Ciyptogenic fibrosing alvcolitis, D. Central bronchiectasis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Chronic bronchitis does not cause clubbing Pulmonary causes of clubbing: primary and metastatic lung cancer bronchiectasis asbestosis sarcoidosis lung abscess cystic fibrosis tuberculosis mesothelioma other causes include inflammatory bowel disease,infective endocarditis,cyanotic congenital hea disease ,hepatic cirrhosis etc', 'role': 'assistant'}]