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: Unknown
[{'content': 'Lamina cribrosa is not present in \nSelect and explain. \nA. Morning glory syndrome, B. Nanophthalmia, C. Coloboma of retina, D. Optic nerve agenesis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Morning glory syndrome is a mesodermal defect in which there is peripapillary defect along with absence of lamina cribrosa.', 'role': 'assistant'}]