The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Extension of odontoblast processes into enamel   (A) Enamel spindle   (B) Cracks   (C) Primary dentin   (D) Secondary Dentine
['(A) Enamel spindle <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Enamel spindle \n (B) Cracks \n (C) Primary dentin \n (D) Secondary Dentine <> possible answers', '  Extension of odontoblast processes into enamel <> context@']