This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
Typical JVP finding in cardiac tamponade 
Select and explain. 
A. Absent 'Y' descent, B. Prominant 'a' wave, C. Absent 'a' wave, D. Prominant 'Y' wave
A: Absent 'Y' descent
Answer: A: Absent 'Y' descent 
Explanation: Ref Harrison 19 th ed pg 1462 Cardiac tamponade is characterized by jugular venous diatenaiod ( increased JVP) with a prominent X descent but an ,absent Y descent.