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': 'Ridge soreness in denture patients may be associated with \nSelect and explain. \nA. gagging, B. malocclusion, C. overextension, D. Lack of retention', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]