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 19 year old patient came to the out patient depament with complaints of primary amenorrhea. She had well developed breast and pubic hair. However there was absence of vagina and uterus. Likely diagnosis is: \nSelect and explain. \nA. XYY, B. Mullerian agenesis, C. Gonadal dysgenesis, D. Klinefelter's syndrome", 'role': 'user'}, {'content': "Answer: B \nExplanation: Mullerian agenesis (Mayer-Rokitansky-Kuster-Hauser syndrome) is the second most common cause of primary amenorrhea. These individuals have normal ovarian development, normal endocrine function, and normal female sexual development. The physical findings are a shoened or absent vagina in addition to absence of the uterus, although small masses resembling a rudimentary uterus may be noted. These individuals have a 46,XX karyotype. Ref: Rosen M.P., Cedars M.I. (2011). Chapter 13. Female Reproductive Endocrinology and Infeility. In D.G. Gardner, D. Shoback (Eds), Greenspan's Basic & Clinical Endocrinology, 9e.", 'role': 'assistant'}]