This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anatomy, Development and clinical examination, Subject name: Ophthalmology
The length of the eyeball is 
Select and explain. 
A. 12mm, B. 16mm, C. 24mm, D. 30mm
C: 24mm
Answer: C: 24mm 
Explanation: Eyeball - Not a perfect sphere but an Ablate spheroid Dimensions of an adult eyeball Anteroposterior diameter - 24 mm Horizontal diameter - 23.5 mm Veical diameter - 23 mm Circumference - 75 mm Volume - 6.5 ml Reference : Khurana Ophthalmology; 4th edition Page 3