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A syndrome in which human has an extra X-chromosome is

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

A syndrome in which human has an extra X-chromosome is klinefelter's syndrome
Hence (B) is the correct answer.