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: Medicine
For cystic lesions in brain, investigation of choice is: 
Select and explain. 
A. Ultrasound, B. Angiography, C. C.T. Scan, D. MRI scan
C: C.T. Scan
Answer: C: C.T. Scan 
Explanation: None