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': 'Which of the following passes through the foramen magnum - \nSelect and explain. \nA. Vertebral Artery, B. Sympathetic chain, C. XIth cranial nerve, D. Internal carotid Artery', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Structures passing through foramen magnum are :\n\n\nAnterior part:- Apical ligament of dens, membrane tectoria, vertical band of the cruciate ligament.\nPosterior part:- the Lowest part of the medulla oblongata, three meninges (dura, arachnoid and pia mater).\nSubarachnoid space:- Spinal accessory nerves, vertebral artery and sympathetic plexus around it, posterior spinal arteries, anterior spinal arteries.', 'role': 'assistant'}]