This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Physiology
Regulation of coronary circulation is? 
Select and explain. 
A. Autonomic, B. Autoregulatory, C. Hormonal, D. Sympathetic
B: Autoregulatory
Answer: B: Autoregulatory 
Explanation: The caliber of the coronary vessels, and consequently the rate of coronary blood flow, is influenced not only by pressure changes in the aoa but also by chemical and neural factors. The coronary circulation shows considerable autoregulation.Ref: Ganong's Review of Medical Physiology Twenty-Third Edition Page No: 579