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
Hyaloid artery starts to regress at 
Select and explain. 
A. Birth, B. 3 - 4 months of period of gestation, C. 6 - 7 months of period of gestation, D. 2 - 3 weeks after birth
B: 3 - 4 months of period of gestation
Answer: B: 3 - 4 months of period of gestation 
Explanation: Hyaloid artery starts to regress at 3 - 4 months of period of gestation.