This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General physiology, Subject name: Physiology
Bradykinin causes 
Select and explain. 
A. Stimulation of the visceral smooth muscle, B. Stimulation of the vascular smooth muscle, C. Inhibition of the visceral smooth muscIe, D. Inhibition of the vascular smooth muscle
A: Stimulation of the visceral smooth muscle
Answer: A: Stimulation of the visceral smooth muscle 
Explanation: They cause contraction of visceral smooth muscle, but they relax vascular smooth muscle NO, lowering blood pressure. Bradykinin is a potent vasodilator. (Ref: Ganong's review of medical physiology 23rd Edition page no.566)