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 vertical fracture of root seen with gutta percha obturation is due to: \nSelect and explain. \nA. The vertical compression of warm GP points, B. Lateral condensation of GP points, C. Use of spreader, D. Injection molding technique', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]