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': 'In a woman presenting with amenorrhea headache, blurred vision and galactorrhea appropriate investigation: \nSelect and explain. \nA. Prolactin levels, B. LH, C. FSH, D. HCG', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A women presenting with headache, blurred vision and galactorrhea raises of a pituitary prolactinoma and so appropriate investigation would be:\n\nS prolactin (most important)\nTSH (as patients with hypothyroidism have elevated TRH which acts to stimulate the release of prolactin)\nX ray skull (shows space occupying lesion)\nMRI\nContrast enhanced CT', 'role': 'assistant'}]