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 direct filling gold segments can be compacted: \nSelect and explain. \nA. By hand pressure alone, B. By hand pressure combined with a hand mallet, C. By using electromallet, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The gold segments can be compacted by hand pressure alone, by\xa0hand\xa0pressure\xa0combined with a\xa0hand\xa0mallet, or by a mechanical\xa0device\xa0 that\xa0is\xa0activated\xa0by\xa0a\xa0spring,\xa0pneumatic pressure, or electronically (using an electromallet). \nThe direction of force application, the amount of applied pressure, and the compaction pattern are critically important factors controlling the quality of the gold restoration.\n\nRef:Phillip’s Science of Dental Materials ed 12 pg 414', 'role': 'assistant'}]