This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S, Subject name: Medicine
A patient with engorged neck veins, BP 80/50 and pulse rate of 100 following blunt trauma to the chest . Diagnosis of 
Select and explain. 
A. Pneumothorax, B. Right ventricular failure, C. Cardiac tamponade, D. Hemothorax
C: Cardiac tamponade
Answer: C: Cardiac tamponade 
Explanation: Ref Harrison 19 th ed pg 1573-1574 Cardiac tamponade should be suspected in any patient who has a rapid down hill course and exhibits the features of rising venous pressure and falling aerial pressure following blunt trauma to the chest.