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': 'All of the following conditions are associated with clubbing except: March 2012 \nSelect and explain. \nA. Bronchogenic carcinoma, B. Chronic bronchitis, C. Empyema, D. Bronchiectasis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans: B i.e. Chronic bronchitis Causes of clubbing Respiratory causes of digital clubbing includes bronchogenic carcinoma, asbestosis (especially with mesothelioma), suppurative lung disease (empyema, Bronchiectasis, cystic fibrosis), fibrosing alvelolitis etc. Finger clubbing is not a feature of COPD and should trigger fuher investigation for lung cancer, Bronchiectasis or fibrosis', 'role': 'assistant'}]