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: Dental
[{'content': 'The use of electro surgery facilitate impression making by \nSelect and explain. \nA. Reopening the gingival sulcus, B. Forcing the impression material, C. Enlarging the gingival sulcus and control of hemorrhage, D. Hemorrhage', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]