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': 'For making temporary restorations, the impression material preferred is: \nSelect and explain. \nA. Alginate, B. Polyvinyl siloxane, C. Both, D. None of the above', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The technique involves making a preoperative impression with elastic impression material. Alginate impression materials may be used and are relatively inexpensive. The preoperative impression may be made with polyvinyl siloxane (PVS) impression material, if additional accuracy, stability\xa0and durability are required.\nSturdevant operative dentistry\xa07th Edition, Page No:120', 'role': 'assistant'}]