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
Adult size of the cornea is attained by the age of: 
Select and explain. 
A. 2 years, B. 3 years, C. 5 years, D. 9 years
A: 2 years
Answer: A: 2 years 
Explanation: Ans. 2 years