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
A 30-year-old women presents a history of amenorrhoea and impaired vision of six month's duration. Physical examination shows everything except for pale optic discs and diminished visual acuity. The most likely diagnosis is - 
Select and explain. 
A. Pituitary adenoma, B. Craniopharyngioma, C. Hypothalamic glioma, D. Benign intracranial hypertension
A: Pituitary adenoma
Answer: A: Pituitary adenoma 
Explanation: None