This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Medicine
C wave in JVP is DUE TO 
Select and explain. 
A. Bulging of tricuspid valve during the isovolumetric contraction phase, B. Atrial systole, C. Passive filling ventricle, D. Atrial relaxation
A: Bulging of tricuspid valve during the isovolumetric contraction phase
Answer: A: Bulging of tricuspid valve during the isovolumetric contraction phase 
Explanation: ref : rhagawa rao cardiology