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: ENT
[{'content': "Bell's palsy not responding to the steroid. What will be the further line of management - \nSelect and explain. \nA. Increase the dose of steroid, B. Vasodilators and ACTH, C. Surgical decompression, D. Electrophysiological nerve testing", 'role': 'user'}, {'content': "Answer: D \nExplanation: If the patient of Bell's palsy is not responding to conservative treatment, electrodiagnostic study (electrophysiological study) should be done.\nThe electrodiagnostic study includes electromyography (EMG), Electroneurography (ENG), minimal excitability test and maximal excitability test.\nSurgery is reserved for those who meet electrodiagnostic (electrophysiological) study criteria or are worsening on medical treatment.", 'role': 'assistant'}]