This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: New Born Infants, Subject name: Pediatrics
Cause of neonatal hyperbilirubinemia ? 
Select and explain. 
A. Inefficient ervthropoiesis, B. RBC hemoglobin, C. Immature liver enzyme, D. All of above
D: All of above
Answer: D: All of above 
Explanation: Ans. is 'd' i.e., All of aboveAvery -textbook of neonatology (P.1536/ed 6th)o 75% of daily billirubin production in Neonats came from normal destruction of circulating RBC.o 25% comes from other factor like.Ineffective erythropoiesisDestruction of immature RBCo Immature UDPGT activity in foetal liver especially preterm baby.