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
[{'content': 'Main cause of shock is? \nSelect and explain. \nA. Hypoxia, B. Hypotension, C. Hypoperfusion of tissue, D. Not recalled', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]