input: The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Which of the following tooth structure during formation is most effected due to Vit -A deficiency   (A) Enamel   (B) Dentin   (C) Cementom   (D) Periodontal Ligament
output: ['(A) Enamel <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Enamel  (B) Dentin  (C) Cementom  (D) Periodontal Ligament <> possible answers', '  Which of the following tooth structure during formation\nis most effected due to Vit -A deficiency <> context']