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: Surgery
A 60 year old man, with an accident and comes to emergency department with engorged neck veins, pallor, rapid pulse. He has muffled heart sounds. The likely diagnosis is 
Select and explain. 
A. Cardiac tamponade, B. Aortic dissection, C. Pneumothorax, D. Diaphragmatic rupture
B: Aortic dissection
Answer: B: Aortic dissection 
Explanation: This is a case of cardiac tamponande.
Becks traid - muffled heart sounds + engorged neck veins + decreased BP