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: Pathology
[{'content': 'Bradykinin causes all the following except \nSelect and explain. \nA. Smooth muscle contraction, B. Dilatation of blood vessels, C. Pain, D. Opsonisation', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]