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': 'Clinical wastes in hospitals are to be disposed in which colour bags \nSelect and explain. \nA. Yellow, B. Black, C. Green, D. Red', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]