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': 'According to US FDA, the machine used for taking intraoral radiographs is classified as \nSelect and explain. \nA. Class-I, B. Class-II, C. Class-III, D. Class-IV', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]