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
Congenital pit in optic nerve causes ? 
Select and explain. 
A. Macular retinal detachment, B. Visual field defects, C. Central serous retinopathy, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: Ans D - All of the above