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
A lady with amenorrhea and galactorrhea, what is the cause of this? 
Select and explain. 
A. Pituitary adenoma, B. Adrenal hyperplasia, C. 70 alpha hydroxylase deficiency, D. None of above
A: Pituitary adenoma
Answer: A: Pituitary adenoma 
Explanation: 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.