This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: A.N.S., Subject name: Pharmacology
[{'content': 'Precursor of adrenaline producing renal vasodilation is? \nSelect and explain. \nA. Dopamine, B. Adrenaline, C. Noradrenaline, D. Acetylcholine', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans: A (Dopamine) Ref:KDT, 6th ed,p. 126Dopamine: is a D1. D2, alpha & beta 1 agonist.Low doses -D1 receptor in renal & mesenteric blood vessels (dilation) - increase GFR, increase Na+ excretion.Moderate dosesBeta 1 receptor - inotropic action - increase cardiac contractility, no effect on heart rate.Large doses -Alpha 1 receptor - vasoconstriction - increase BP.', 'role': 'assistant'}]