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: None', 'role': 'assistant'}]