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': "According to the Andreasen's modified classification of traumatic injuries, a fracture involving the enamel, coronal and radicular dentin and cementum with exposure of the pulp is categorized as: \nSelect and explain. \nA. Complicated tooth fracture, B. Uncomplicated crown root fracture, C. Complicated crown root fracture, D. Uncomplicated crown fracture", 'role': 'user'}, {'content': 'Answer: C \nExplanation: Complicated crown fracture: A fracture involving\xa0enamel and dentin, and exposing the pulp.\nUncomplicated crown-root fracture: A fracture involving enamel, coronal and radicular dentin, and cementum, but not exposing pulp.\nComplicated crown-root fracture: A fracture involving\xa0enamel, coronal and radicular dentin, and cementum\xa0with exposure of the pulp.\nRoot fracture: A fracture involving radicular dentin,\xa0cementum\xa0and pulp.', 'role': 'assistant'}]