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': 'Occlusal night guards are used to \nSelect and explain. \nA. Prevent bruxism, B. Reduce pocket formation, C. Redistribute forces on teeth, D. Permit eruption or elongation of teeth', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]