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 the following are features of alveolitis (interstitial lung disease) EXCEPT- \nSelect and explain. \nA. Exertional dyspnea, B. Early productive cough, C. Digital clubbing, D. Coarse crepitations during inspiration', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]