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: Physiology
[{'content': 'Stroke output of each ventricle in normal adult is: \nSelect and explain. \nA. 30 ml, B. 130 ml, C. 70 ml, D. 5 liters', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]