This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pharmacology
[{'content': 'Following are the structure passing through foramen magnum except (NOT REALTED TO PHARMACOLOGY) \nSelect and explain. \nA. Cerebellar tonsils, B. Spinal cord, C. Spinal accessory nerve, D. Veebral aery', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Structure crossing foramen magnum is lower medulla. The Spinal cord begins at the upper border of atlas veebra.', 'role': 'assistant'}]