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': "Not self retaining hand held retractor (s) is/are: \nSelect and explain. \nA. Mollison's mastoid retractor, B. Jansen's mastoid retractor, C. Lempe's endaural retractor, D. Davis Retractor", 'role': 'user'}, {'content': 'Answer: D \nExplanation: Answer- D. Davis RetractorThese retractors do not need an assistant to hold them in place.It hold tissue apa and lock it in place.Hand held retractor-Hohmann RetractorLahey RetractorSenn RetractorBlair (Rollet) RetractorRigid RakeFlexible RakeRagnell RetractorLinde-Ragnell RetractorDavis Retractor', 'role': 'assistant'}]