This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: AIIMS 2019, Subject name: Physiology
Sequential arrangement question on JVP. Staing with "a" wave. A-First hea sound B-T wave C-R wave D-Rapid ejection phase 
Select and explain. 
A. A,B,C,D, B. A,C,D,B, C. C,A,D,B, D. D,C,B,A
C: C,A,D,B
Answer: C: C,A,D,B 
Explanation: Sequential arrangement - JVP waves: - A wave - atrial systole C wave - Iso volumetric contraction V wave - Iso volumetric relaxation Arrangement of ventricular events - Atrial systole - 'A' wave in JVP, | Ventricular systole - 'QRS' complex (ventricular depolarization) | AV valves closes - 1st hea sound | SL valve open - rapid ejection | Ventricular repolarization - T - wave