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
The normal value of P50 on the oxyhaemoglobin dissociation curve in an adult is 
Select and explain. 
A. 1.8 kPa, B. 2.7 kPa, C. 3.6 kPa, D. 4.5 kPa
C: 3.6 kPa
Answer: C: 3.6 kPa 
Explanation: Adult Hb- 50% saturation at PO2 of 26mmHg.
1mmHg= 0.133 KPa
26mmHg= 0.133 X 26 = 3.45