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: Anatomy
[{'content': 'Maximum cross sectional area is seen in which of the following vessels? \nSelect and explain. \nA. Arteries, B. Capillaries, C. Arterioles, D. Veins', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Maximum cross sectional area is seen in capillaries.', 'role': 'assistant'}]