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
[{'content': 'The shape of eyeball is \nSelect and explain. \nA. Ovoid, B. Circular, C. Sphero - ovoid, D. Ablate spheroid', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]