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
Which of the following is not a feature of cardiac tamponade? 
Select and explain. 
A. Pulsus paradoxus, B. Kussmaul's sign, C. Electrical Alternans, D. Diastolic collapse of right ventricle on echocardiogram
B: Kussmaul's sign
Answer: B: Kussmaul's sign 
Explanation: Kussmaul's sign