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# Extra chromosome 'X' is present in which one of the following diseases?

$\begin{array}{1 1}(A)\;\text{Down's syndrome}\\(B)\;\text{Klinefelter's syndrome}\\(C)\;\text{Turner's syndrome}\\(D)\;\text{Bleeder's disease}\end{array}$

Klinefelter's syndrome
Hence (B) is the correct answer.