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 transaxial section through the head. Which structure may be obliterated by a pituitary tumor? 
Select and explain. 
A. A, B. B, C. C, D. D
C: C
Answer: C: C 
Explanation: (c) The suprasellar cistern can be obliterated by a pituitary tumor.