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': 'DMF index does not show? \nSelect and explain. \nA. Number of decay tooth, B. Number of restoration, C. Severity of decay, D. Missing tooth due to decay', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]