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': 'Congenital pit in optic nerve causes ? \nSelect and explain. \nA. Macular retinal detachment, B. Visual field defects, C. Central serous retinopathy, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans D - All of the above', 'role': 'assistant'}]