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
Kussmauls sign is seen in all except - 
Select and explain. 
A. Constrictive pericarditis, B. Right vertricular infarct, C. Restictive cardiomyopathy, D. Cardiac tamponade
D: Cardiac tamponade
Answer: D: Cardiac tamponade 
Explanation: None