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
All of the following hea sounds occur sholy after S2, EXCEPT: 
Select and explain. 
A. Opening snap, B. Pericardial knock, C. Ejection click, D. Tumor plop
C: Ejection click
Answer: C: Ejection click 
Explanation: Pericardial knock, Opening snap, and Tumor plop occurs sholy after S2. Ejection click occurs after S1.