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 shape of eyeball is 
Select and explain. 
A. Ovoid, B. Circular, C. Sphero - ovoid, D. Ablate spheroid
D: Ablate spheroid
Answer: D: Ablate spheroid 
Explanation: None