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': "A young patient presents to the ophthalmology clinic with loss of central vision. ERG is normal but EOG is abnormal. Which of the following is the most likely diagnosis - \nSelect and explain. \nA. Stargardt's disease, B. Best's Vitelliform Dystrophy, C. Retinitis Pigmentosa, D. Cone- Rod Dystrophy", 'role': 'user'}, {'content': "Answer: B \nExplanation: Normal ERG with an abnormal EOG is charachteristic of best's vittelliform dystrophy.", 'role': 'assistant'}]