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
Pulsus paradoxus is present in - 
Select and explain. 
A. Emphysema, B. Pulmonary embolism, C. Hypovolemic shock, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: None