This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Plastic & Reconstructive Surgery, Subject name: Surgery
[{'content': 'The given instrument is used for harvesting the graft from healthy area in split skin thickness graft. What is this called? \nSelect and explain. \nA. Humby knife, B. Silvers knife, C. Dermatome, D. Catlin amputating knife', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A. Humby knife* This is a "Humby" skin-grafting knife, formerly owned by Sir Edward "Weary"Dunlop, and made in 1950s.Silver\'s knifeBrown dermatome', 'role': 'assistant'}]