This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Physiology
[{'content': 'Which of these carries maximum blood? \nSelect and explain. \nA. Aeries, B. Veins, C. Aoa, D. Aerioles', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Because of their propeies of distensibility and collapsibility, veins serve as blood reservoirsAbout 60-70% of the blood present in the venous system Ref: Medical Physiology Indu Khurana 2015 edition page No:241', 'role': 'assistant'}]