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
Inflammatory changes in the soft tissue surrounding an implant is diagnosed as 
Select and explain. 
A. Peri-implant gingivitis, B. Peri-implantitis, C. Peri-implant mucositis, D. Peri-implantosis
C: Peri-implant mucositis
Answer: C: Peri-implant mucositis 
Explanation: None