This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Physiology
Dicrotic notch is caused by 
Select and explain. 
A. Closure of mitral valve, B. Opening of mitral valve, C. Closure of aoic valve, D. Opening of aoic valve
C: Closure of aoic valve
Answer: C: Closure of aoic valve 
Explanation: Closure of aoic and pulmonary valve causes a characteristic notch called dicrotic notch or incisura in pulse wave tracing Ref : Ganong 25th ed/page 540