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
2, 3-BPG binds to sites of haemoglobin and the affinity for oxygen 
Select and explain. 
A. 4, decreases, B. 1, decreases, C. 4, increases, D. 1, increases
B: 1, decreases
Answer: B: 1, decreases 
Explanation: Answer- B. 1, decreases2,3-BPG binds to 1 site of haemoglobin and decreases the affinity for oxygen.2, 3 Bisphosphoglycerate (2,3- BPG) or 2,3 Diphosphoglycerate 2,3- DPG)It is most abundant organic phosphate in RBC.