The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Model plaster (white) used to cast study models before mixing with water, is largely composed of:   (A) CaO   (B) CaCO3   (C) CaSO4  • ½H2O   (D) CaSO4 • 2H2O
['(C) CaSO4\xa0 • ½H2O <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) CaO \n (B) CaCO3 \n (C) CaSO4\xa0 • ½H2O \n (D) CaSO4 • 2H2O <> possible answers', '  Model plaster (white) used to cast study models before mixing with water, is largely composed of: <> context@']