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': 'Not an indication for tooth grinding: \nSelect and explain. \nA. Wear facets, B. TMJ pain, C. Crepitus, D. Cemental wear', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]