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: Pathology
[{'content': 'Difference in nicotinic stomatitis from papillary hyperplasia: \nSelect and explain. \nA. Multiple dots at periphery, B. Rings at centre, C. Small centrally placed dot, D. Rings at periphery', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]