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
Which of the following condition is associated with giant 'v' waves in a JVP? 
Select and explain. 
A. VSD, B. TR, C. Complete hea block, D. AF
B: TR
Answer: B: TR 
Explanation: Giant v waves are seen in tricuspid regurgitation and VSD. v wave in a JVP represents atrial filling and occur during ventricular systole. In tricuspid regurgitation there is an accentuated v wave followed by a rapid y descend. In progressive TR, v wave merges with the c wave and the right atrial and juglar vein waveforms become ventricularised. Reference: Harrison's Principles of Internal Medicine 18th edition chapter 227.