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': 'Parents of a 9 year old boy are concerned about the appearance of front teeth. He is indulged in thumb sucking till date. Intraoral findings are flaring of maxillary and mandibular incisors , increased overjet ,anterior open bite and constricted maxillary arch. Who introduced the appliance that has been given to this child: \nSelect and explain. \nA. Baker, B. Haskell and Mink, C. Hotz, D. Ritto', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The Bluegrass appliance incorporates a modified, six-sided roller constructed to spin around a 0.045-inch stainless steel wire when rolled by the tongue. Haskell and Mink reported successful stoppage of thumb-sucking in children using the\xa0appliance with a program of positive reinforcement. The use of rakes and spurs in habit therapy has also been reported\xa0with success.\nNote: Bluegrass appliance is fixed intraoral anti- thumb sucking appliance and is placed for 3-6 months. Lingual Pearl was given by Ritto.\xa0Hotz has given the modification of oral screen.\xa0Baker has given the modification for Bluegrass appliance.', 'role': 'assistant'}]