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
[{'content': '30 year old female comes with visual defects, breast engorgement and Amenorrhea. Investigation of choice is \nSelect and explain. \nA. CT brain, B. Serum prolactin, C. Biopsy, D. Mr angiography', 'role': 'user'}, {'content': 'Answer: B \nExplanation: This is likely to be a case of pituitary adenoma. The most common pituitary adenoma causing the symptoms is prolactinoma.', 'role': 'assistant'}]