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
Oxyhemoglobin saturation does not depend upon? 
Select and explain. 
A. Temperature, B. Fetal haemoglobin and adult haemoglobin ratio, C. Skin color, D. 2,3 DPG
C: Skin color
Answer: C: Skin color 
Explanation: None