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': 'A female patient aged 40 years comes for routine general examination. Full mouth radiographs are taken. Oval shaped radiolucent areas are seen in the root canals of maxillary central incisors Teeth are asymptomatic and show feeble response to vitality tests.\n\nHow do you obturate the canal? \nSelect and explain. \nA. Thermafill technique, B. Vertical compaction technique, C. Thermoplasticised gutta-percha technique, D. Lateral compaction technique', 'role': 'user'}, {'content': 'Answer: C \nExplanation: THERMOPLASTICIZED INJECTABLE GUTTA-PERCHA OBTURATION\n(Obtura II Heated Gutta-percha System/High Heat System)\nThis technique was introduced in 1977 at Harvard institute.\nIndication for using obtura II\n\nRoots with straight or slightly curved canals.\xa0\nFor backfilling of canals.\xa0\nFor obturation of roots with internal resorption, perforations, etc.\xa0\n\nKey concept:\xa0\nFor any kind of root resorption, thermoplasticized GP obturation technique is preferred.', 'role': 'assistant'}]