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': 'Arden index is related to: \nSelect and explain. \nA. ERG (Electroretinogram), B. EOG (Electroculogram), C. VER (Visual evoked response), D. Perimetry', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. EOG (Electroculogram)', 'role': 'assistant'}]