This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
[{'content': 'Action of 20mcg/kg/min dopamine is \nSelect and explain. \nA. Renal vasodilatation, B. Vasoconstriction, C. Increased blood pressure, D. Increased myocardiac contractility', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Less than 2mcg/kg/min: Renal VD 2-10mcg/kg/min: B1 stimulation More than 10: alpha stimulation -VC', 'role': 'assistant'}]