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
[{'content': 'A lady presents with galactorrhea and visual defects. Investigation to be done is \nSelect and explain. \nA. Serum prolactin, B. CT scan of brain, C. MRI, D. Angiography', 'role': 'user'}, {'content': 'Answer: C \nExplanation: MRI is the imaging of choice for pituitary tumour. It is preferred over CT scan.', 'role': 'assistant'}]