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': 'Inflammatory changes in the soft tissue surrounding an implant is diagnosed as \nSelect and explain. \nA. Peri-implant gingivitis, B. Peri-implantitis, C. Peri-implant mucositis, D. Peri-implantosis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]