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
[{'content': 'Investigation of choice of hyperprolactinemia- \nSelect and explain. \nA. TRH estimation, B. LH estimation, C. Prolactin estimation, D. Estradiol estimation', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Diagnosis of Hyperprolactinemia\n\nHyperprolactinemia is common in young women and plasma prolactin should be measured in women with amenorrhoea whether or not galactorrhoea is present.\n\u200bDiagnosis of hyperprolactinemia is established by measuring fasting morning prolactin level.\nHormone secretion is pulsatile and vary widely therefore it is necessary to measure hormone levels on several different occasions.\n\nProlactin level\n\n> 200 ng/ml\xa0 →\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0 Occur only in prolactinoma\n100-200 ng/ml\xa0 →\xa0\xa0 Strongly suggest prolactinoma\n< 100 ng/ml\xa0\xa0\xa0 →\xa0\xa0\xa0\xa0\xa0 Due to any cause except prolactin secreting adenoma.', 'role': 'assistant'}]