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: Medicine
Lifespan of RBCs in premature neonate 
Select and explain. 
A. 120 days, B. 60 days, C. 90 days, D. 40 days
D: 40 days
Answer: D: 40 days 
Explanation: Adults - 120 days.
Term infant - 60 - 90 days.
Premature neonate - 35 - 50 days.