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': 'Oxygen affinity is increased by all of the following except \nSelect and explain. \nA. Alkalosis, B. Hypoxia, C. Increased HbF, D. Hypothermia', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]