input: The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Lidocaine produces its antiarrhythmic effects by   (A) Increasing A-V conduction   (B) Decreasing cardiac excitability   (C) Increasing cardiac conduction velocity   (D) Increasing spontaneous pacemaker activity
output: ['(B) Decreasing cardiac excitability <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Increasing A-V conduction  (B) Decreasing cardiac excitability  (C) Increasing cardiac conduction velocity  (D) Increasing spontaneous pacemaker activity <> possible answers', '  Lidocaine produces its antiarrhythmic effects by <> context']