This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: ECG and Arrhythmia 3, Subject name: Medicine
A 65-year-old man is about to undergo an elective hip replacement. A pre-operative ECG is taken (see below). Based upon the ECG, which of the following jugular venous pressure (JVP) abnormalities is most likely to be present? 
Select and explain. 
A. Absent A waves, B. Cannon A waves, C. Giant V waves, D. Rise in JVP during inspiration
A: Absent A waves
Answer: A: Absent A waves 
Explanation: ECG= Variable RR interval in the later pa of ECG. So, it is Dx of Atrial fibrillation. Option A: Absent A wave Option B: Cannon A waves found in Hea Block & Junctional tachycardia Option C: Giant V wave=TR Option D: Rise JVP during Inspiration= Kussmaul sign