Given below are two statements : Statement I : Down's syndrome is caused by the absence of one of the X-chromosomes. Statement II : Turner's syndrome is caused by the presence of an additional copy of the chromosomes. In the light of the above statements, choose the correct answer from the options given below :

1. A. Both Statement I and Statement II are correct
2. B. Both Statement I and Statement II are incorrect
3. C. Statement I is correct but Statement II is incorrect
4. D. Statement I is incorrect but Statement II is correct

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