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
Placing cast under tap water is to be avoided as 
Select and explain. 
A. a)	H2O interferes with hygroscopic expansion, B. b)	H2O Inhibits polymerization of dental resin, C. c)	H2O interferes with crystallization of dihydrate, D. d)	Gypsum is slightly soluble in water and the surface of the cast will be eroded
D: d)	Gypsum is slightly soluble in water and the surface of the cast will be eroded
Answer: D: d)	Gypsum is slightly soluble in water and the surface of the cast will be eroded 
Explanation: None