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': 'Absence of Lamina cribrosa occurs in \nSelect and explain. \nA. Optic nerve hypoplasia agenesis, B. Morning glory syndrome, C. Drusen, D. Non opthalmia', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. Morning glory syndrome', 'role': 'assistant'}]