The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Dustless alginate is produced by   (A) Reducing the diatomaceous earth   (B) Adding heavy metal salts   (C) Coating with dihydric alcohol   (D) Altering the matrix
['(C) Coating with dihydric alcohol <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Reducing the diatomaceous earth \n (B) Adding heavy metal salts \n (C) Coating with dihydric alcohol \n (D) Altering the matrix <> possible answers', '  Dustless alginate is produced by <> context@']