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': 'Windkassal effect is seen in: \nSelect and explain. \nA. Large elastic vessel, B. Capillaries, C. Capacitance vessel, D. Venules', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) Large elastic vessel', 'role': 'assistant'}]