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
Action of 20mcg/kg/min dopamine is 
Select and explain. 
A. Renal vasodilatation, B. Vasoconstriction, C. Increased blood pressure, D. Increased myocardiac contractility
B: Vasoconstriction
Answer: B: Vasoconstriction 
Explanation: Less than 2mcg/kg/min: Renal VD 2-10mcg/kg/min: B1 stimulation More than 10: alpha stimulation -VC