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 hemoglobin has higher affinity for oxygen due to: 
Select and explain. 
A. Decreased 2, 3 DPG concentration, B. Reduced pH, C. Increased release of carbon dioxide, D. Oxygen dissociation curve is shifted to right
A: Decreased 2, 3 DPG concentration
Answer: A: Decreased 2, 3 DPG concentration 
Explanation: A i.e. Decreased 2, 3 DPG concentration