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': 'What is the main role of angiotensin II? \nSelect and explain. \nA. Increased TPR, B. Constriction of afferent renal aeriole, C. Decrease release of aldosterone, D. Diuresis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Angiotensin 2 has 2 principal effects that can elevate aerial pressureVasoconstriction in many areas of body ie increases total peripheral resistance.Decreased excretion of salt and water.Angiotensin 2 constricts both afferent and efferent aerioles but efferent aeriole is more sensitive and hence constriction of efferent aeriole predominates.Angiotensin 2 causes release of aldosterone from adrenal glandsRef: Guyton and Hall, Textbook of medical physiology, 2nd South Asia Edition, page no. 273Textbook of medical physiology by N Geetha, 3rd edition, page no. 384', 'role': 'assistant'}]