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
In a patient with Cardiac output 5 litre/min and body surface area 1.7 square metre, what will be the cardiac index? 
Select and explain. 
A. 3 l/min/sq. m, B. 4 l/min/sq. m, C. 5 l/min/sq. m, D. 2.5 l/min/sq. m
A: 3 l/min/sq. m
Answer: A: 3 l/min/sq. m 
Explanation: None