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 one of the following is indicative of cardiac tamponade? 
Select and explain. 
A. Pulsus paradoxus, B. Wide pulse pressure, C. Kussmaul's sign, D. Forceful apical. impulse
A: Pulsus paradoxus
Answer: A: Pulsus paradoxus 
Explanation: None