The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Unpaired structures in the brain:   (A) Basilar artery   (B) Vertebral artery   (C) Middle cerebral artery   (D) Anterior cerebral artery
['(A) Basilar artery <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Basilar artery \n (B) Vertebral artery \n (C) Middle cerebral artery \n (D) Anterior cerebral artery <> possible answers', '  Unpaired structures in the brain: <> context@']