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
The axial length of eyeball at birth is ……………………… % of an adult eye – 
Select and explain. 
A. 100, B. 90, C. 70, D. 40
C: 70
Answer: C: 70 
Explanation: Anteroposterior diameter of eyeball at birth is about 16.5 mm (70% of adult size which is attained by 7-8 years).