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 class -III Ellis fracture \nSelect and explain. \nA. Only enamel is involved, B. Enamel and dentin are involved, C. Enamel, dentin and pulp are involved, D. Non-vital pulp', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]