This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Heart, Circulation, and Blood, Subject name: Physiology
[{'content': 'Largest storage of blood is in? \nSelect and explain. \nA. Capillaries, B. Veins, C. Arteries, D. Venules', 'role': 'user'}, {'content': 'Answer: B \nExplanation: ANSWER: (B) VeinsREF: Ganongs 22nd edp.595Veins are also called capacitance vessels because they contain the maximum amount of blood in circulation', 'role': 'assistant'}]