This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Mullerian Abnormalities, Subject name: Gynaecology & Obstetrics
[{'content': "Which of the following is true for Klinefilter's syndrome? \nSelect and explain. \nA. 45 XO, B. Tall stature, C. Intelligent Quotient Normal, D. Normal testis and genitalia", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Klinefelter syndrome Rare disorder, Karyotype 47 XXY, Externally resembles a male in general body conformity, Penis small or normal, Testes small, Gynaecomastia, Appearance eunuchoid, Mentally retarded, Azoospermia,Infeility, Tall stature, Testosterone may help in Rx Breasts may need surgical excision.', 'role': 'assistant'}]