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
The arachnoid villi responsible for cerebrospinal fluid absorption protrude mainly in the: 
Select and explain. 
A. Superior sagittal sinus, B. Inferior sagittal sinus, C. Straight sinus, D. Transverse sinus
A: Superior sagittal sinus
Answer: A: Superior sagittal sinus 
Explanation: A i.e. Superior saggital sinus