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': 'Which of the following investment material can be heated up to 1200 degrees centigrade? \nSelect and explain. \nA. Gypsum bonded, B. Phosphate bonded, C. Silica bonded, D. All of the above', 'role': 'user'}, {'content': "Answer: C \nExplanation: When the ethyl silicate–bonded investment is\xa0heated to a sufficiently high temperature, some silica converts\xa0to\xa0quartz\xa0and\xa0provides\xa0added\xa0expansion.\xa0This\xa0type\xa0of investment can be heated to between 1090 °C and 1180 °C and is compatible with the higher-fusing alloys.\xa0\nNote- Phosphate bonded investment is heated upto 1050 °C.\nClosest answer is silica bonded investment materials.\nPhillip's Dental Materials ed 12 pg 226", 'role': 'assistant'}]