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
[{'content': 'The hormone involved in the regulation of blood pressure is \nSelect and explain. \nA. Serotonin, B. Histamine, C. Angiotensin, D. Prostaglandin', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The hormone involved in the regulation of blood pressure is Angiotensin II. Angiotensin II is a powerful vasoconstrictor that increases the total peripheral resistance and decreases Na+ and H2O excretion by kidney, thereby causing an increase in aerial BP. Humoral Regulation of BP Ref: Ganong Medical Physiology 26th edition PGno: 586', 'role': 'assistant'}]