This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Complications of Chronic Otitis Media, Subject name: ENT
[{'content': 'All of the following are the uses of given instrument except : \nSelect and explain. \nA. Harvesting Temporalis fascia, B. Self retaining and haemostatic, C. In mastoidectomy to retract soft tissues after incision, D. Helps in removal of bone', 'role': 'user'}, {'content': "Answer: D \nExplanation: Mollison's mastoid retractor Self retaining mastoid retractor with four prongs on either blade USES- Harvesting Temporalis fascia Used in mastoidectomy to retract soft tissues after incision and elevation of flaps It is self retaining and haemostatic Mastoid Gouge -Help in removal of bone Perkin's mastoid retractor has 1x3 prongs", 'role': 'assistant'}]