input: The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Nitrous oxide alone is not used as a G.A agent because of   (A) Difficulty in maintaining an adequate oxygen concentration   (B) Expense of the agent and its exposure hazards   (C) Adverse effect on liver   (D) Poor analgesic property
output: ['(A) Difficulty in maintaining an adequate oxygen concentration <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Difficulty in maintaining an adequate oxygen concentration  (B) Expense of the agent and its exposure hazards  (C) Adverse effect on liver  (D) Poor analgesic property <> possible answers', '  Nitrous oxide alone is not used as a G.A agent because of <> context']