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
Pulses paradoxus is seen in: 
Select and explain. 
A. Shock, B. Elderly, C. Emphysema/Asthma, D. High output state
C: Emphysema/Asthma
Answer: C: Emphysema/Asthma 
Explanation: None