This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anatomy
[{'content': 'All the following are contents of sub-occipital triangle, except - \nSelect and explain. \nA. Vertebral artery, B. Dorsal ramus of C1 nerve, C. Suboccipital plexus of vein, D. Occipital artery', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Contents of suboccipital triangle are vertebral artery (3rd part), suboccipital nerve (dorsal ramus of C1) and suboccipital venous plexus. Occipital artery lies in occipital triangle.', 'role': 'assistant'}]