Gynaecomastia is a symptom of:

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(D) Gynaecomastia refers to the development of breast tissue in males. This condition is a characteristic clinical feature of $Klinefelter's$ syndrome

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Klinefelter's syndrome

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(D) Gynaecomastia refers to the development of breast tissue in males. This condition is a characteristic clinical feature of $Klinefelter's$ syndrome. In this genetic disorder,the individual has an extra $X$ chromosome,resulting in a $47, XXY$ karyotype. The presence of the additional $X$ chromosome leads to feminization,including the development of breast tissue,sparse body hair,and reduced muscle mass.

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