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': 'The type of hemoglobin that has least affinity for 2,3- Diphosphoglycerate (2,3-DPG) or (2,3-BPG) is: \nSelect and explain. \nA. Hg A., B. Hg F, C. H B, D. Hg A2.', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. HgF 2,3. DPG does not combine with fetal hemoglobin 2,3DPG & Hemoglobin 2,3 DPG is present in high concentration in erythrocytes (HbA> HbA2) 2,3 DPG greatly reduces the affinity of Hb to O2 Q (shifts O2-dissociation curve to right) Fetus Hb (HbF) consists of a2Y2, this tetramer has much lower affinity for 2-3 DPG than adult HbQ Corresponding a higher affinity for O2.', 'role': 'assistant'}]