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': 'All of the following are causes of primary amenorrhoea with eugonadism, EXCEPT: \nSelect and explain. \nA. GnRH deficiency, B. PCOS, C. Mullerian agenesis, D. Congenital adrenal hyperplasia', 'role': 'user'}, {'content': 'Answer: A \nExplanation: GnRH deficiency is cause of primary amenorrhoea with low FSH levels. Causes of primary amenorrhea with eugonadism: Mullerian agenesis Vaginal septum Imperforate hymen Androgen insensitivity syndrome PCOS Congenital adrenal hyperplasia Cushing and thyroid disease Ref: Hoffman B.L., Schorge J.O., Schaffer J.I., Halvorson L.M., Bradshaw K.D., Cunningham F.G., Calver L.E. (2012). Chapter 16. Amenorrhea. In B.L. Hoffman, J.O. Schorge, J.I. Schaffer, L.M. Halvorson, K.D. Bradshaw, F.G. Cunningham, L.E. Calver (Eds), Williams Gynecology, 2e.', 'role': 'assistant'}]