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
[{'content': 'A preterm baby of 26 weeks of gestation is born. At what age should screening for Retinopathy of Prematurity (ROP) be done \nSelect and explain. \nA. 2 weeks postnatal life, B. 3 weeks postnatal life, C. 4 weeks postnatal life, D. 5 weeks postnatal life', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Normally, for all Preterm babies ROP screening is done 32 weeks of gestation or 4 weeks postnatal life whichever is later.\nBut, in newborn born < 28 weeks of gestation, ROP Screening is done at 3 weeks postnatal life.', 'role': 'assistant'}]