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': "In Elli 's classification of injured teeth a class IV represents \nSelect and explain. \nA. Non-vital tooth, B. Avulsed tooth, C. Fracture involving only the enamel, D. Fracture involving enamel and dentin but not pulp", 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]