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': 'Anchorage in removable appliances is provided by: \nSelect and explain. \nA. Acrylic base only, B. Teeth, C. Acrylic base and teeth, D. Retentive clasps', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]