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
Commonest cause for grommet insertion- 
Select and explain. 
A. Secretory otitis media, B. Otosclerosis, C. CSOM, D. Cholesteatoma
A: Secretory otitis media
Answer: A: Secretory otitis media 
Explanation: None