Trisomy 13 is seen in –: (A) Edward Syndrome, (B) Patau Syndrome, (C) Down Syndrome, (D) Turner Syndrome
Answer is B. Trisomy 13 - Patau Syndrome 
Trisomy 18 - Edward Syndrome 
Trisomy 21 - Down Syndrome 
XO - Turner Syndrome 
XXY - Klinefelter's syndrome