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': 'Increased amount of powder in zinc phosphate cement mixture will cause: \nSelect and explain. \nA. Decreased strength, B. Decreased film thickness, C. Decreased solubility, D. Increased setting time', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Factors affecting solubility:\n\nPowder-liquid ratio: Thicker mixes show less solubility.\nWater content of liquid: Any change in the water content is accompanied by increased solubility.\nEffect of moisture contamination: Premature contact of the incompletely set cement with\xa0water results in the dissolution and leaching of the surface. Varnish application over the\xa0exposed cement margin is beneficial.\n\nRef: Manappalil P: 91,92', 'role': 'assistant'}]