This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ear, Subject name: ENT
True about Glue ear 
Select and explain. 
A. Is painful, B. Is painless, C. Radical mastoidectomy is required, D. NaF is useful
B: Is painless
Answer: B: Is painless 
Explanation: Glue ear is a painless and nonpurulent effusion of middle ear cleft. It occurs due to malfunctioning of the eustachian tube and increased secretory activity of middle ear mucosa. It can be controlled by decongestants and middle ear aeration. The surgical method of correction is by myringotomy with the aspiration of fluid and grommet inseion. Ref: PL Dhingra 7th edition of Ear, Nose and Throat; Pg no 69