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: Surgery
[{'content': "Knife used for harvesting split thickness skin grafts is \nSelect and explain. \nA. Husson's knife, B. Bard parker's knife, C. Humby's knife, D. Foley's knife", 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]