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
Which of the following is included in the Levenson criteria for congenital cholesteatoma 
Select and explain. 
A. White mass medial to normal tympanic membrane, B. Attico-antral perforation of the tympanic membrane, C. Definite history of otorrhoea, D. History of prior otologic procedures
A: White mass medial to normal tympanic membrane
Answer: A: White mass medial to normal tympanic membrane 
Explanation: levenson's criteria : Mass medial to the tympanic membrane. Normal tympanic membrane. No previous history of ear discharge, perforation or ear surgery. Ref: Internet sources.