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
In a lady with bilateral superior temporal quadrantopia, galactorrhea, the most probable cause is: 
Select and explain. 
A. Pituitary macroadenoma, B. Craniopharyngioma, C. Sheehan's syndrome, D. Pituitary hypophysitis
A: Pituitary macroadenoma
Answer: A: Pituitary macroadenoma 
Explanation: Answer is A (Pituitary Macroadenoma): Presence of galactorrhea (hyperprolactinemia) and bitemporal superior quadrantopia (visual field defect) is consistent with a diagnosis of pituitary macroadenoma. Both non secretory pituitary Macroadenoma and prolactin secreting Macroadenoma (Large Prolactinoma) may produce the above manifestation.