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': 'Addition of large amounts of platinum to a casting\ngold alloy will: \nSelect and explain. \nA. Decrease its strength and ability to be hardened, B. Decrease its tarnish resistance, C. Increase its fusion temperature, D. Redden the alloy', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Platinum\nIt increases strength and corrosion resistance. It also increases melting point and has a whitening effect on the alloy. It helps to reduce the grain size.\nThe\xa0transformation between vapor, liquid, and solid is called the change of state. A change from the solid to the liquid state will require additional energy—kinetic energy—to break loose from the force of attraction. This additional energy is called the latent heat of fusion. The temperature at which this change occurs is known as the melting temperature or fusion temperature.\nMannapalli 3 ed page 274; Phillips 12th ed page 18', 'role': 'assistant'}]