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: Physiology
[{'content': 'Autoregulation means \nSelect and explain. \nA. Maintains the blood flow, B. Vary with change in pressure, C. Regulated by local metabolites, D. Well developed in the skin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]