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': 'High Viscosity GIC was discovered in? \nSelect and explain. \nA. 1990, B. 1980, C. 1970, D. 2000', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]