The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Which material is carried in a custom tray?   (A) High fusing compound   (B) Reversible hydrocolloid   (C) Metallic oxide paste   (D) Irreversible hydrocolloid
['(C) Metallic oxide paste <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) High fusing compound \n (B) Reversible hydrocolloid \n (C) Metallic oxide paste \n (D) Irreversible hydrocolloid <> possible answers', '  Which material is carried in a custom tray? <> context@']