The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Which of the following impression material requires a hardener?   (A) Agar   (B) Alginate   (C) Elastomers   (D) Impression compound
['(A) Agar <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Agar \n (B) Alginate \n (C) Elastomers \n (D) Impression compound <> possible answers', '  Which of the following impression material requires a hardener? <> context@']