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
Middle ear effusion with intact eardrum gives rise to which type of tympanogram? 
Select and explain. 
A. Type A, B. Type B, C. Type C, D. Type D
B: Type B
Answer: B: Type B 
Explanation: 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.