This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Head & Neck, Subject name: Anatomy
Choose the appropriate lettered structure in this MRI scan showing a sagittal section through the head and neck. Which structure runs along the line of attachment of the falx cerebri to the tentorium cerebelli? 
Select and explain. 
A. A, B. B, C. C, D. D
D: D
Answer: D: D 
Explanation: (d) The straight sinus runs along the line of the attachment of the falx cerebri to the tentorium cerebelli, which supports the occipital lobe of the cerebrum and covers the cerebellum.