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': 'Volume of blood ejected per min/sq.m. surface area of the body is known as: \nSelect and explain. \nA. Stroke volume., B. Minute volume., C. Cardiac index., D. None', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]