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': 'Setting time of MTA is: \nSelect and explain. \nA. 60 + - 5 minutes, B. 120 + - 5 minutes, C. 165 + - 5 minutes, D. 30 + - 5 minutes', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Mineral trioxide aggregate (MTA) was developed by Dr Torabinejad.\nSetting time is 2 hours and 45 minutes.\nRef : Textbook of endodontics, Nisha Garg and Amit Garg, 3rd edition, pg no:551', 'role': 'assistant'}]