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': 'Placing cast under tap water is to be avoided as \nSelect and explain. \nA. a)\tH2O interferes with hygroscopic expansion, B. b)\tH2O Inhibits polymerization of dental resin, C. c)\tH2O interferes with crystallization of dihydrate, D. d)\tGypsum is slightly soluble in water and the surface of the cast will be eroded', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]