The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Which of the following is a phosphoryn indicating dentin presence   (A) Nestin   (B) Arestin   (C) Collagen   (D) All of the above
['(A) Nestin <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Nestin \n (B) Arestin \n (C) Collagen \n (D) All of the above <> possible answers', '  Which of the following is a phosphoryn indicating dentin presence <> context@']