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
Volume of blood ejected per min/sq.m. surface area of the body is known as: 
Select and explain. 
A. Stroke volume., B. Minute volume., C. Cardiac index., D. None
C: Cardiac index.
Answer: C: Cardiac index. 
Explanation: None