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': 'SADE classification is for \nSelect and explain. \nA. Rectraction of pars Tensa of Tympanic membrane, B. Rectraction of Pars Flaccida of Tympanic membrane, C. Tympanosclerosis, D. Perforation of Tympanic membrane', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Sade classification: Retraction of Pars Tensa.\nTos classification: Retraction of Pars Flaccida', 'role': 'assistant'}]