This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Sex Intersexuality, Subject name: Gynaecology & Obstetrics
[{'content': "Which of the following is true for Klinefelter's syndrome? \nSelect and explain. \nA. 45X0, B. Arm span and height more, C. Attains puberty normally, D. Normal testis and genitalia", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. b. Arm span and height moreKlinefelter Syndrome (47, XXY) is seen in 1 in 1,000 births.Genetics; most common findings manifested at pubertyFindingsDecreased IQ (average IQ 85-90)Behavioral/psychiatric problemsLong limbs (decreased upper: lower segment ratio)Slim (weight/height ratio low)Hypogonadism and hypogenitalism (testosterone replacement at age 11-12 years)=hypergonadotropic hypogonadism (increased FSH and LH, and decreased testosterone)Infertility in almost allGynecomastiaExtra MileTall statureUsually a normal variant (familial tall stature)Other causes: exogenous obesity, endocrine causes (growth hormone excess , androgen excess [tall as children, short as adults)Syndromes: Homocystinuria, Sotos, Klinefelter', 'role': 'assistant'}]