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
True about anatomy of adult cornea: 
Select and explain. 
A. Horizontal diameter is 12 mm, B. Horizontal diameter is 10 mm, C. In megalocornea diameter is >12 mm, D. Veical diameter> Horizontal diameter
A: Horizontal diameter is 12 mm
Answer: A: Horizontal diameter is 12 mm 
Explanation: Ans. Horizontal diameter is 12 mm