This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Male Reproductive System, Subject name: Physiology
What is the nongenomic effect of testosterone on vascular smooth muscle? 
Select and explain. 
A. Vasodilation, B. Vasoconstriction, C. Increase in prostaglandins, D. Increase in estrogen receptors
A: Vasodilation
Answer: A: Vasodilation 
Explanation: Testosterone causes vasodilation by inhibiting L-type calcium channels to inhibit calcium influx into the cells, thus causing vasodilation