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': 'Over-trituration of silver alloy and mercury: \nSelect and explain. \nA. Reduces contraction, B. Increases the strength of lathe-cut alloy but reduces the strength of spherical alloy amalgam, C. Decreases creep, D. Gives al dull and crumbly amalgam', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]