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
[{'content': 'Oxyhemoglobin saturation does not depend upon? \nSelect and explain. \nA. Temperature, B. Fetal haemoglobin and adult haemoglobin ratio, C. Skin color, D. 2,3 DPG', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]