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: Biochemistry
[{'content': '2,3-BPG binds to sit, itaemogitiniti and the affinit\\es gen \nSelect and explain. \nA. 4, decreases, B. 1, decreases, C. 4, increases, D. 1, increases', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. b. 1, decreases', 'role': 'assistant'}]