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': 'In diagnosis of retinitis pigmentosa ERG is: \nSelect and explain. \nA. More sensitive than the EOG, B. Less sensitive than the EOG, C. Equally sensitive as EOG, D. None of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. Less sensitive than the EOG', 'role': 'assistant'}]