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
[{'content': 'What is true in case of perforation of pars flaccida? \nSelect and explain. \nA. CSOM is a rare cause, B. Associated with cholesteatoma, C. Usually due to trauma, D. All of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B Associated with cholesteatomaTympanic membrane can be divided in 2 pas:Parstensa : It forms most of the tympanic membrane. Its periphery is thickened to form fibro cailaginous ring called as annulus tympanicus.Pars Falccida : It is situated above the lateral process of malleus between the notch of Rivinus and the anterior and posterior malleolar folD. Perforation in tympanic membrane can be in Central* Occurs in tubotympanic type ofCSOM* Not associated with cholesteatoma* Considered safe Marginal (Perforation destroys even the annulus) theraby reaching sulcus tympanicusMost common is posterio superiormarqinal?- occur in attico antral type of CSOM- associated with cholesteatoma- considered unsafe / dangerous Attic perforation NoteMost common cause of perforation is chronic otitis mediaMnemonicFamousF - Perforation of Pars FlaccidA.A - Seen in Atticoantral/marginal perforationM - Associated with CSOM (of atticoantral type) or acute necrotizing otitis mediao - Associated with CholesteatomaU - Unsafe typeS - Surgery is TOe.', 'role': 'assistant'}]