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': 'Adequate mixing of mercury is indicated by: \nSelect and explain. \nA. Dry Mix, B. Shiny Mix, C. Short Mixing Time, D. None', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]