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: Physiology
In JVP 'c' wave indicates which of the following cardiac events? 
Select and explain. 
A. Atrial filling, B. Atrial contraction, C. Ventricular filling, D. Ventricular contraction
D: Ventricular contraction
Answer: D: Ventricular contraction 
Explanation: The 'c' wave is the transmitted manifestation of the rise in atrial pressure produced by bulging of the tricuspid valve into the atria during isovolumetric contraction. 'a' wave is atrial systole, 'v' wave rise in atrial pressure before tricuspid valve opens during systole.