The correct option is A Down's syndrome
Down's syndrome is also known as trisomy 21. It is a genetic disorder caused by the presence of all or part of a third copy of chromosome 21. So, it is a trisomic autosomal congenital disease. Turner syndrome is monosomy caused by absence of one copy of X-chromosome. Presence of one or more extra copy of X-chromosome in males causes Klinefelter syndrome.
Thus, the correct answer is option B.