input: The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Gingiva is most commonly affected by deficiency of:   (A) Vitamin A   (B) Vitamin D   (C) Vitamin C   (D) Vitamin B
output: ['(C) Vitamin C <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Vitamin A  (B) Vitamin D  (C) Vitamin C  (D) Vitamin B <> possible answers', '  Gingiva is most commonly affected by deficiency of: <> context']