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': 'The thickness of split thickness skin graft used in maxitlofacial surgery ranges from \nSelect and explain. \nA. 2 to 3 mm, B. 1 to 2 mm, C. 0.3 to 0.5 mm, D. 1.3 to 1.5 mm', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]