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': 'In post core which of following gutta-percha technique is used \nSelect and explain. \nA. Thermoplasticized, B. Vertical, C. Sectional, D. Lateral', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]