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
Great cerebral vein of Galen drains into - 
Select and explain. 
A. Cavernous sinus, B. Basal vein, C. Internal cerebral vein, D. Straight sinus
D: Straight sinus
Answer: D: Straight sinus 
Explanation: 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