This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ocular Embryology& Anatomy, Subject name: Ophthalmology
[{'content': 'Fetal /choroidal fissure is closed by which week of gestation \nSelect and explain. \nA. 3rd week, B. 4th week, C. 6th week, D. 8th week', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Fetal fissure is closed by 6th week Failure to close can lead to formation of coloboma(eg- pear shaped coloboma of iris,chorioretinal coloboma i)', 'role': 'assistant'}]