This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Heart, Circulation, and Blood, Subject name: Physiology
[{'content': 'Regulation of coronary circulation \nSelect and explain. \nA. Autonomic, B. Autoregulatory, C. Hormonal, D. Sympathetic', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. (b) AutoregulatoryRef: Ganong, 25th ed/p.612AutoregulationIt is the capacity of the tissue to regulate their blood flow - intrinsic basal myogenic toneLocal Metabolism is the primary controller of coronary flow - O2 demand is a major factorThis mechanism works well even when the nerves are removed', 'role': 'assistant'}]