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': '"Whistle"\tis\ta\tword\tsubstitute\tfor\texplaining\tthe\nfollowing instrument in children - \nSelect and explain. \nA. High speed hand piece, B. Suction apparatus, C. Low speed hand piece, D. Air syringe', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]