This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Excretory System (Kidney, Bladder) Acid-Base Balance, Subject name: Physiology
[{'content': 'The regional aerial resistance of the mesentery and kidney is reduced by- \nSelect and explain. \nA. Dopamine, B. Nor adrenaline, C. Adrenaline, D. Isoprenaline', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The D1 receptor in renal and mesenteric blood vessels are the most sensitive. I/V infusion of low dose of dopamine dilates these vessels (by raising intracellular cAMP). This increases GFR in addition dopamine exes natriuretic effect by D1 receptors on proximal tubules.', 'role': 'assistant'}]