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
Oxygen affinity is increased by all of the following except 
Select and explain. 
A. Alkalosis, B. Hypoxia, C. Increased HbF, D. Hypothermia
B: Hypoxia
Answer: B: Hypoxia 
Explanation: None