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': 'Prolonged calcium hydroxide therapy for root resorption causes risk of: \nSelect and explain. \nA. Cervical root fracture., B. Apical third fracture., C. Middle third fracture., D. None of the above.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Cervical root resorption is the best answer among the option but if in options vertical root fracture is given then go for vertical root fracture.', 'role': 'assistant'}]