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
If the cycle stas with ' a ' wave of jvp . Arrange the following in order- 
Select and explain. 
A. R wave, B. T wave, C. 1st hea sound and Rapid ejection phase, D. All
D: All
Answer: D: All 
Explanation: Answer- D. AllThe "a" wave is approximately synchronous with the first hea sound (S1) and just precedes the carotid upstroke.Sholy after the a-wave there is a second peak , the c-wave. The c-wave immediately follows the r wave of the ECG waveform.The v-wave corresponds to the end of the t wave in the ECG waveform.