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 years 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 but normal ovaries. Likely diagnosis is: \nSelect and explain. \nA. XYY, B. Mullerian agenesis, C. Gonadal dysgenesis, D. Klinefelter's syndrome", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. b. Mullerian agenesis Mullerian agenesis is the cause of primary amenorrhea, which is characterized by absence of uterus /vagina, also known as Rokitansky-Kuster- Hausen syndrome.', 'role': 'assistant'}]