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
One intern calculated the concentration of 02 in blood as 0.0025 ml/m1 of blood. Considering atmospheric pressure as 760mmHg, how much approx. 02 tension could have been in the blood ? 
Select and explain. 
A. 40mmHg, B. 60mmHg, C. 80mmHg, D. 100mmHg
C: 80mmHg
Answer: C: 80mmHg 
Explanation: C i.e. 80 mm Hg