This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ear, Subject name: ENT
[{'content': "What is true about Meniere&;s disease \nSelect and explain. \nA. Semont's manoeuvre is used for treatment, B. Electrocochleography is the gold standard for diagnosis, C. Surgery is the mainstay of treatment, D. V shaped audiogram is seen", 'role': 'user'}, {'content': "Answer: B \nExplanation: Electrocochleography shows changes diagnostic of Meniere's disease. Normally the ratio of summating potential to action potential is 30%. In Meniere's disease, this ratio is greater than 30%. Ref: Diseases of EAR, NOSE and THROAT by PL Dhingra; 7th Edition; page no.113", 'role': 'assistant'}]