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': "Austin's classification for ossicular chain defects depends on - \nSelect and explain. \nA. Malleus head and stapes footplate, B. Malleus handle and stapes suprastructure, C. Malleus head and stapes suprastructure, D. Malleus head and stapes head", 'role': 'user'}, {'content': "Answer: B \nExplanation: Austin - Kartush classification of ossicular chain defect\n\nTo predict reconstructive success, the status of the middle ear and ossicular chain needs to be assessed.\nThe Austin - Kartush classification of ossicular chain defects provides a method for defining pre-reconstructive ossicular status.\nAustin's original classification had four groups:-\n\n\nMalleus handle and stapes suprastructure present\nMalleus handle present, stapes suprastructure absent\nMalleus handle absent, stapes suprastructure present\nMalleus handle and stapes suprastructure absent\n\n\nKartush modified this scheme by adding three classes:-\n\nE. \xa0Intact ossicular chain\nF. Ossicular head fixation\nG. Stapes fixation", 'role': 'assistant'}]