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': 'Congenital anomalies of the optic disc include all except: \nSelect and explain. \nA. Coloboma, B. Drusen, C. Hypoplasia, D. Medullated nerve fibres', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. Medullated nerve fibres', 'role': 'assistant'}]