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: Unknown
[{'content': 'Great cerebral vein of Galen drains into - \nSelect and explain. \nA. Cavernous sinus, B. Basal vein, C. Internal cerebral vein, D. Straight sinus', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Straight sinuso Great cerebral vein of Galen is formed by the union of two internal cerebral veins.o It is 2 cm long.o It is drains into the straight sinus.o Its tributaries arei) Internal cerebral veinsii Basal veinsiii) Occipital veinsiv) Posterior callosal vein", 'role': 'assistant'}]