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': 'In 1947 a committee at ADA recommended symbolically, which of the following tooth numbering system \nSelect and explain. \nA. Zsigmondy/Palmer system, B. ADA system, C. Two digit system, D. Zsigmondy/Palmer system & ADA system', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]