This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Normal Menstruation, Abnormal Menstruation, Menopausal Physiology and forsight of conception, Subject name: Gynaecology & Obstetrics
[{'content': 'Which level of prolactin definitely suggest hyperprolactinemia? \nSelect and explain. \nA. 200 ng/mL, B. 150 ng/mL, C. 50 ng/mL, D. 100 ng/mL', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Elevations in prolactin may cause amenorrhea or galactorrhea. Amenorrhea without galactorrhea is associated with hyperprolactinemia in approximately 15% of women. In patients with both galactorrhea and amenorrhea, approximately two-thirds will have hyperprolactinemia; of those, approximately one-third will have a pituitary adenoma. In more than one-third of women with hyperprolactinemia, a radiologic abnormality consistent with a microadenoma (<1 cm) is found. Normal Prolactin levels Males: 2-20 ng/mL Females (non-pregnant): 2-30 ng/mL Pregnant females: 10-200 ng/mL A prolactin level of more than 200 ng/mL is usually due to a pituitary tumour and requires pituitary evaluation', 'role': 'assistant'}]