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
[{'content': 'Which is not an action of bradykinin? \nSelect and explain. \nA. Vasoconstriction, B. Increased vascular permeability, C. Chemo attractant, D. Pain on injection', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Bradykinin is a powerful vasodilator. (Ref: Textbook of physiology N Geetha 2nd edition page no.180)', 'role': 'assistant'}]