This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Medicine
A 40 year old lady with temporal field defects and glactorrhoea is most likely to have- 
Select and explain. 
A. Pituitary macroadenoma, B. Craniopharyngioma, C. Lactational failure, D. Pregnancy
A: Pituitary macroadenoma
Answer: A: Pituitary macroadenoma 
Explanation: adenoma of the pituitary gland causing increased secretion of prolactin resulting in galactorrhea and causes CNS compression causing temporal field defects (Harrison 17 pg 2206)