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
Main cause of shock is? 
Select and explain. 
A. Hypoxia, B. Hypotension, C. Hypoperfusion of tissue, D. Not recalled
C: Hypoperfusion of tissue
Answer: C: Hypoperfusion of tissue 
Explanation: None