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 due to 
Select and explain. 
A. Atrial contraction, B. Atrial filling, C. Tricuspid bulging, D. Rapid ventricular filling
C: Tricuspid bulging
Answer: C: Tricuspid bulging 
Explanation: None