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': 'In electralloy calcium is alloyed with gold, as calcium: \nSelect and explain. \nA. Increase whiteness of the alloy, B. Increase corrosion resistance, C. Increases the strength., D. Increase opacity.', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The electrolytic precipitate of gold is alloyed with 0.1% calcium.\nCalcium increases the strength by dispersion strengthening', 'role': 'assistant'}]