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
Kussmaul's sign is positive in 
a. Restrictive cardiomyopathy 
b. Constrictive pericarditis 
c. Cardiac tamponade 
d. Dilated cardiomyopathy 
e. Pneumothorax 
Select and explain. 
A. a,b,e, B. a,b, C. a,c,d,e, D. a,b,c,d,e
B: a,b
Answer: B: a,b 
Explanation: Kussmaul's sign is rise in JVP with inspiration.  It is seen in constrictive pericarditis  and Restrictive cardiomyopathy.