Gynaecomastia is the symptom of

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(A) . Klinefelter's syndrome.Gynaecomastia,which is the development of enlarged breast tissue in males,is a characteristic symptom of Klinefelter's sy

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Klinefelter's syndrome

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(A) . Klinefelter's syndrome.Gynaecomastia,which is the development of enlarged breast tissue in males,is a characteristic symptom of Klinefelter's syndrome.Klinefelter's syndrome is a genetic condition caused by chromosomal aneuploidy where males possess an extra $X$ chromosome,resulting in an $XXY$ genotype.This condition leads to symptoms such as reduced testosterone levels,small testes,reduced fertility,and the development of female-like secondary sexual characteristics,including gynaecomastia.

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