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
Silent chest is seen in- 
Select and explain. 
A. Very severe asthma, B. Chronic bronchitis, C. Emphysema, D. Bronchiectasis
A: Very severe asthma
Answer: A: Very severe asthma 
Explanation: None