This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Inflammation & Repair, Subject name: Pathology
[{'content': 'Vasodilation in acute inflammation is first shown by \nSelect and explain. \nA. Venules, B. Arterioles, C. Capillaries, D. Vein', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. (b) Arterioles(Ref: Robbins 9th/pg 74; 8th/pg 47)Vasodilation first involves the arterioles and then leads to opening of new capillary beds in the area.The result is increased blood flow, which is the cause of heat and redness (erythema) at the site of inflammation.', 'role': 'assistant'}]