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 can be used as best root end filling material? \nSelect and explain. \nA. MTA, B. ZOE, C. Amalgam, D. Calcium hydroxide', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Clinical Note\xa0\n\nAmalgam was once the most common root-end\xa0filling material, but it is not recommended presently due to corrosion and dimensional changes, unsightly amalgam tattoos, biocompatibility, and safety issues.\xa0\nMTA is the recommended root end filling material of choice.\xa0\nIRM and SuperEBA are other commonly recommended alternatives.\n\nReference: Grossman endodontics, 13th ed page no 479', 'role': 'assistant'}]