input: The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Which of the following best describes the working time of impression material?   (A) After the start of appearing elastic properties of impression material   (B) Just after the start of appearing elastic properties of impression material   (C) The time from start of mixing till just before the start of appearing elastic properties of impression material   (D) Loss of lusture of impression material
output: ['(C) The time from start of mixing till just before the start of appearing elastic properties of impression material <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) After the start of appearing elastic properties of impression material  (B) Just after the start of appearing elastic properties of impression material  (C) The time from start of mixing till just before the start of appearing elastic properties of impression material  (D) Loss of lusture of impression material <> possible answers', '  Which of the following best describes the working time of impression material? <> context']