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': 'Hypersensitivity vasculitis is most commonly seen in: \nSelect and explain. \nA. Post capillary venules, B. Aerioles, C. Veins, D. Capillaries', 'role': 'user'}, {'content': 'Answer: A \nExplanation: . Post capillary venules', 'role': 'assistant'}]