The following are multiple choice questions (with answers) about medical knowledge.   **Question:** What is the thickness of cement-dentinal junction?   (A) 1-2 μm   (B) 2-3 μm   (C) 3-4 μm   (D) 4-5 μm
['(B) 2-3 μm <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) 1-2 μm \n (B) 2-3 μm \n (C) 3-4 μm \n (D) 4-5 μm <> possible answers', '  What is the thickness of cement-dentinal junction? <> context@']