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: Gynaecology & Obstetrics
[{'content': 'A middle aged female presents with increasing visual loss, breast enlargement and irregular menses. Investigation of choice would be: \nSelect and explain. \nA. S. calcitonin, B. S. prolactin, C. S. hemoglobin concentration, D. S. calcium', 'role': 'user'}, {'content': 'Answer: B \nExplanation: A middle aged female is presenting with:\n\nIncreasing visual loss\nBreast enlargement\nIrregular menses\n\nAll these features can be explained by pituitary adenoma.\n\nMost common type of pituitary adenomas prolactinomas\nProlactinomas can be diagnosed by raised serum prolactin levels so, the investigation of choice here is serum prolactin level\n\nAlso Known: Work up of patient with amenorrhea, galactorrhea, and hyperprolactinemia', 'role': 'assistant'}]