This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S, Subject name: Medicine
The &;a&;wave of jugular venous pulse is produced by- 
Select and explain. 
A. Atrial relaxation, B. Atrial systole, C. Atrial diastole, D. Rapid venous filling
B: Atrial systole
Answer: B: Atrial systole 
Explanation: JVP or jugular venous is a reflection of the right atrial pressure.The "a" wave in JVP reflects atrial systole Ref Harrison 20th edition pg 1436