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B
Klinefelter's syndrome
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C
Down's syndrome
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D
Both (A) & (B)
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Solution
The correct option is B Klinefelter's syndrome
In klinefelter’s syndrome, there is a trisomy of allosomes, that is, three sex chromosomes are present. An individual suffering from klinefelter’s syndrome has two X and one Y chromosome instead of the usual one X and one Y chromosome. So, the correct answer is 'Klinefelter's syndrome'.