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': 'ART was introduced in \nSelect and explain. \nA. Tanzania, B. South Africa, C. USA, D. Zimbabwe', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]