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': 'In infant most sensitive audiometric screening is - \nSelect and explain. \nA. Electrocochleography, B. BERA, C. Cortical evoked response, D. Tympanometry', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]