This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: JIPMER 2018, Subject name: Physiology
Normal cardiac index in an adult is:- 
Select and explain. 
A. 5.9 L/min/M2, B. 2.3 L/min/M2, C. 3.2 L/min/M2, D. 4.6 L/min/M2
C: 3.2 L/min/M2
Answer: C: 3.2 L/min/M2 
Explanation: Cardiac index: - Experiments have shown that the cardiac output increase approximately in propoion to the surface area of the body. Therefore - cardiac output is frequently stated in terms of the cardiac index, which is cardiac output per square meter of body surface area. - The avg. Human being who weight 70 kg has a BSA of about 1.7 sq. meter. Which means that the normal average cardiac index for adults is about 3 L / min / M2 of BSA.