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
Onset of stereopsis occurs at the age of: 
Select and explain. 
A. 3 to 5 months, B. 1 to 2 years, C. 5 years, D. 7 years
A: 3 to 5 months
Answer: A: 3 to 5 months 
Explanation: Ans. 3 to 5 months