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
Arden index is related to: 
Select and explain. 
A. ERG (Electroretinogram), B. EOG (Electroculogram), C. VER (Visual evoked response), D. Perimetry
B: EOG (Electroculogram)
Answer: B: EOG (Electroculogram) 
Explanation: Ans. EOG (Electroculogram)