input: The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Magnesium deficiency has been reported as an etiological cause for:   (A) Bruxism.   (B) Nail biting.   (C) Thumb sucking.   (D) All of the above.
output: ['(A) Bruxism. <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Bruxism.  (B) Nail biting.  (C) Thumb sucking.  (D) All of the above. <> possible answers', '  Magnesium deficiency has been reported as an etiological cause for: <> context']