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: Pediatrics
A feature of fetal RBC in adult – 
Select and explain. 
A. Alkali denaturation resistant, B. Small in size, C. Has more 2,3 DPG level, D. More iron than adult RBC
A: Alkali denaturation resistant
Answer: A: Alkali denaturation resistant 
Explanation: Features of fetal RBCs

It contains less 2,3 DPG
It is alkali denaturation resistant
It is larger in size than adult RBC → Larger in volume
It contains less iron than adult RBC
Life span is less.