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': 'Middle ear effusion with intact eardrum gives rise to which type of tympanogram? \nSelect and explain. \nA. Type A, B. Type B, C. Type C, D. Type D', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Type B tympanogram is flat in appearance, indicating lack of compliance. The volume measurement that is simultaneously performed with tympanometry helps to differentiate between a flat tympanogram suggesting an intact eardrum with middle ear effusion and a perforated eardrum or patent ventilating tube.', 'role': 'assistant'}]