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': 'The prognosis for teeth with root fracture is best when\nthe fracture occurs in the \nSelect and explain. \nA. Coronal one third of the root, B. Middle one third of the root, C. Apical one third of the root, D. Coronal half of the root', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]