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': 'Silent chest is seen in- \nSelect and explain. \nA. Very severe asthma, B. Chronic bronchitis, C. Emphysema, D. Bronchiectasis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]