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
Type of tympanic membrane perforation commonly seen in tubotympanic CSOM is 
Select and explain. 
A. Central, B. Antero-superior, C. Postero-superior, D. Postero-inferior
A: Central
Answer: A: Central 
Explanation: Ref: Diseases of ENT by Dhingra 6th edition Pgno : 69-74 Differences between tubotympanic and atticoantral type of CSOM Tubotympanic or safe type Atticoantral or unsafe type Discharge Profuse, mucoid, odourless Scanty, purulent, foul smelling Perforation Central Attic or marginal Granulations Uncommon Common Polyp Pale Red and fleshy Cholesteatoma Absent Present Complications Rare Common Audiogram Mild to moderate conductive deafness Conductive or mixed deafness