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': 'Epulis arises from \nSelect and explain. \nA. Enamel, B. Root of teeth, C. Gingiva, D. Pulp', 'role': 'user'}, {'content': "Answer: C \nExplanation: Epulis literally means 'upon the gum'. Thus it is a swelling situated on the gum.\nIt can originate from the mucous membrane, the periosteum or the bone giving rise to different varieties of Epulis.", 'role': 'assistant'}]