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': 'Implants used in orthodontics are \nSelect and explain. \nA. Endo-osseous implants, B. Trans-osseous implants, C. Micro implants, D. Bioresorbable implants', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Anchorage is the most critical aspect of orthodontics. The anchorage savers do offer extra assistance to anchorage, most recent armamentarium in orthodontics was the introduction of mini screw implants (MSI) and skeletal anchorage system (SAS). Their small size has led to them being called- "mini-implants, micro-implants, mini-screws or mini-pins".\nTextbook of Orthodontics, Gurkeerat Singh 2nd ed page 299', 'role': 'assistant'}]