input: The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Which of the following nonaqueous elastomeric impression materials has the least shelf life   (A) Poly ether   (B) Addition silicone   (C) Condensation silicone   (D) Polysulphide
output: ['(A) Poly ether <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Poly ether  (B) Addition silicone  (C) Condensation silicone  (D) Polysulphide <> possible answers', '  Which of the following nonaqueous elastomeric impression materials has the least shelf life <> context']