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
Fetal Hb shows high pO2 saturation compared to adult Hb because ? 
Select and explain. 
A. Affinity to binding to DPG is different in fetal Hb, B. Right shift to Oxygen dissociation curve, C. Acidic environment, D. Cooperative binding
A: Affinity to binding to DPG is different in fetal Hb
Answer: A: Affinity to binding to DPG is different in fetal Hb 
Explanation: Ans. is 'a' i.e., Affinity to binding to DPG is different in fetal Hb