This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Heart, Circulation, and Blood, Subject name: Physiology
The incisura of arterial pulse corresponds with: 
Select and explain. 
A. SI, B. S2, C. Opening snap, D. S3
B: S2
Answer: B: S2 
Explanation: Ans: B (S2) Ref: l. Pal GK. Cardiac cycle. In: Textbook of medical physiology: Ahuja publishing house. 2007: 73: 601.Explanation:"The dicrotic notch recorded directly from the central aorta is termed the incisura (from the Latin, a cutting into ). The incisura is sharply defined and undoubtedly is related to aortic valve closure. " l See the following figure )