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 haemoglobin has higher affinity for O2 due to 
Select and explain. 
A. Decreased 2,3 DPG concentration, B. Reduced pH, C. Increased release of CO2, D. Oxygen dissociation curve shifted to right
A: Decreased 2,3 DPG concentration
Answer: A: Decreased 2,3 DPG concentration 
Explanation: None