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': 'The great vein of galen drains into the - \nSelect and explain. \nA. Straight sinus, B. Inferior sagital sinus, C. IJV, D. EJV', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Great cerebral vein of Galen drains into the straight sinus.', 'role': 'assistant'}]