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 change in color, shape and texture of gingiva are seen in? \nSelect and explain. \nA. stage 1 gingivitis, B. stage 2 gingivitis, C. stage 3 gingivitis, D. stage 4 gingivitis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]