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: Ophthalmology
[{'content': 'Hyaloid artery starts to regress at \nSelect and explain. \nA. Birth, B. 3 - 4 months of period of gestation, C. 6 - 7 months of period of gestation, D. 2 - 3 weeks after birth', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Hyaloid artery starts to regress at 3 - 4 months of period of gestation.', 'role': 'assistant'}]