This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S, Subject name: Medicine
Bisiferien pulse is seen in - 
Select and explain. 
A. AS+AR, B. Hyperophic cardiomyopathy, C. Severe AR, D. All of above
D: All of above
Answer: D: All of above 
Explanation: Bisferiens pulse: This is a pulse with double peak, both being felt in systole. Mechanism: This is due to a combination of the slow rising pulse and collapsing pulse. Ref: Harrison 20,th edition pg 1445