The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Which surface of tooth has most of plaque?   (A) Gingival third of tooth surface   (B) Incisal one third of tooth surface   (C) Middle third of tooth surface   (D) Uniform on all surfaces
['(A) Gingival third of tooth surface <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Gingival third of tooth surface \n (B) Incisal one third of tooth surface \n (C) Middle third of tooth surface \n (D) Uniform on all surfaces <> possible answers', '  Which surface of tooth has most of plaque? <> context@']