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
Visually-evoked response (VER) is useful in the diagnosis of all of the following except: 
Select and explain. 
A. Retinitis pigmentosa, B. Retrobulbar neuritis, C. Visual potential in eyes with opaque media, D. Optic atrophy
A: Retinitis pigmentosa
Answer: A: Retinitis pigmentosa 
Explanation: Ans. Retinitis pigmentosa