input: The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Von Willebrand factor is secreted by which of the following?   (A) Macrophages   (B) Endothelial cells   (C) Platelets   (D) Fibroblast
output: ['(B) Endothelial cells <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Macrophages  (B) Endothelial cells  (C) Platelets  (D) Fibroblast <> possible answers', '  Von Willebrand factor is secreted by which of the following? <> context']