Select the correct option :

1. A. Klinefelter’s syndrome is due to extra X chromosome and results in sterile male
2. B. Phenylketonuria is X linked disease and results in accumulation of phenylpyruvic acid
3. C. Down’s syndrome is due to triploidy and results in mental retardation
4. D. Turner’s syndrome is due to trisomy and results in sterile female

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