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
[{'content': 'A 40 year old lady with temporal field defects and glactorrhoea is most likely to have- \nSelect and explain. \nA. Pituitary macroadenoma, B. Craniopharyngioma, C. Lactational failure, D. Pregnancy', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 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)', 'role': 'assistant'}]