The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Time required for pre-oxygenation before tracheal intubation   (A) 3 min   (B) 5 min   (C) 2 min   (D) 1 min
['(A) 3 min <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) 3 min \n (B) 5 min \n (C) 2 min \n (D) 1 min <> possible answers', '  Time required for pre-oxygenation before tracheal intubation <> context@']