This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Physiology
[{'content': 'Which of the following statement about bradykinin is true \nSelect and explain. \nA. Causes pain, B. Causes bronchodilation, C. Causes vasoconstriction, D. Decreases vascular permeability', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]