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': 'Healing in root fracture occurs as the fracture line appears as thin radiolucent line, segment would be closely adapted, this healing is with: \nSelect and explain. \nA. Calcified tissue., B. Connective tissue., C. Connective tissue+ calcified tissue., D. Granulation tissue.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]