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': 'Plaster of paris is mixed in \nSelect and explain. \nA. Plastic bowl, B. Rubber bowl, C. Glass bowl, D. Metal bowl', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Spatulation can be continued by hand using a spatula with a stiff blade with the bowl on a vibrator or a power-driven mechanical spatulator.', 'role': 'assistant'}]