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': 'Which of the following test assesses resistance in middle ear - \nSelect and explain. \nA. Pure tone audiometry, B. Impedance audiometry, C. Caloric test, D. BERA (Brainstem evoked response audiometry)', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Impedance Audiometry\n1. It is an objective test for hearingQ\n2. It is very useful in children for assessing the hearing loss. Q\n3. It consists of tympanometry and acoustic reflex\nTympanometry is a measure of the condition of the middle ear at the level of tympanic membrane.\nNOTE:\xa0\n\nFor infants and neonates, tympanograms obtained using a 220 Hz probe may erroneously appear normal.\n\n∴ a higher frequency probe tone (660 or 1000 Hz) must be used', 'role': 'assistant'}]