This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Medicine
A lady presents with galactorrhea and visual defects. Investigation to be done is 
Select and explain. 
A. Serum prolactin, B. CT scan of brain, C. MRI, D. Angiography
C: MRI
Answer: C: MRI 
Explanation: MRI is the imaging of choice for pituitary tumour. It is preferred over CT scan.