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
Most common cause of post-operative shock is 
Select and explain. 
A. Hypokataemia, B. Cardiogenic, C. Septic, D. Air embolism
A: Hypokataemia
Answer: A: Hypokataemia 
Explanation: None