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
Y descent in jugular venous pulsation is due to 
Select and explain. 
A. Ventricular systole, B. Atrial systole, C. Atrial filling, D. Ventricular filling
D: Ventricular filling
Answer: D: Ventricular filling 
Explanation: Y descent is due to passive movement of blood from atria to ventricles i.e. early diastolic filling