This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: FMGE 2019, Subject name: Gynaecology & Obstetrics
[{'content': 'A lady with amenorrhea and galactorrhea, what is the cause of this? \nSelect and explain. \nA. Pituitary adenoma, B. Adrenal hyperplasia, C. 70 alpha hydroxylase deficiency, D. None of above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: In patients with both galactorrhea and amenorrhea, approximately two-thirds will have hyperprolactinemia; of those, approximately one-third will have a pituitary adenoma. A prolactin level as high as 150-200 ng/mL is almost always due to a pituitary adenoma.', 'role': 'assistant'}]