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
The dicrotic notch on the aortic pressure curve is caused by - 
Select and explain. 
A. Closure of the pulmonary valve, B. Rapid filling of the left ventricle, C. Closure of the aortic valve, D. Contraction of the atria
C: Closure of the aortic valve
Answer: C: Closure of the aortic valve 
Explanation: None