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
[{'content': 'Myelination of optic nerve begins at what gestational age- \nSelect and explain. \nA. 2 month, B. 4 month, C. 5 month, D. 7 month', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., 7 months o Myelination of optic nerves starts between 6 and 8 months of gestational age.o Myelination of the optic nerves begins at the lateral geniculate nucleus, reaching the orbital part of the optic nerve at term, and continues over the following 2 years postnatally.o Myelination of geniculostriate pathway begins in the 10th fetal month and is fully mature about 4 months postnatally.o The rate of myelination appears to be hastened by light exposure. Thus, preterm infant, on reaching chronological term, has more advanced myelination than a full-term newborn.", 'role': 'assistant'}]