The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Platelet derived growth factor is released in vessels from:   (A) Endothelial cells   (B) Fibroblasts   (C) Macrophages   (D) Alpha granules
['(D) Alpha granules <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Endothelial cells \n (B) Fibroblasts \n (C) Macrophages \n (D) Alpha granules <> possible answers', '  Platelet derived growth factor is released in vessels from: <> context@']