input: The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Universal marker of limbal epithelial stem cells:   (A) Elastin   (B) Keratin   (C) Collagen   (D) ABCG2
output: ['(D) ABCG2 <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Elastin  (B) Keratin  (C) Collagen  (D) ABCG2 <> possible answers', '  Universal marker of limbal epithelial stem cells: <> context']