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
C wave in JVP indicates: 
Select and explain. 
A. Atrial contraction, B. Bulging of tricuspid valve, C. Ventricle systole, D. Rapid ventricular filling
B: Bulging of tricuspid valve
Answer: B: Bulging of tricuspid valve 
Explanation: Answer is B (Bulging of Tricuspid valve) The 'c' wave in JVP is a positive wave produced by the bulging of the tricuspid valve into the right atrium during right ventricular isovolumetric systole and by the impact of the carotid aery adjacent to the jugular vein.