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
All of the following may be seen in patients of cardiac tamponade except: 
Select and explain. 
A. Kussmaul's sign, B. Pulsus paradoxus, C. Electrical alternans, D. Right ventricular diastolic collapse on echocardiogram
A: Kussmaul's sign
Answer: A: Kussmaul's sign 
Explanation: Answer is A (Kussmaul's sign) Pulsus paradoxus clinically, electrical alternans on ECG and RVDC on Echocardiography are chracteristic features of Cardiac tamponade.