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: Unknown
About O2 dissociation curve, true is: 
Select and explain. 
A. Affinity of O2 with Hb decreases as Hb attaches to O2 in linear fashion, B. 1 Hb attaches to 2 molecules of 2,3 DPG, C. O2 affinity will be equal in both HbF and HbA in the absence of 2, 3DPG is removed, D. Carboxy Hb increases releases of O2 in blood (shift O2 dissociation curve to right)
C: O2 affinity will be equal in both HbF and HbA in the absence of 2, 3DPG is removed
Answer: C: O2 affinity will be equal in both HbF and HbA in the absence of 2, 3DPG is removed 
Explanation: (Refer: Textbook of Medical Biochemistry By S Ramakrishnan. Pg no: 102)
Affinity of Hb F for oxygen and carbon dioxide