This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Specific Cytogenetic Disorders, Subject name: Pathology
Trisomy 13 is identified as: 
Select and explain. 
A. Edward's syndrome, B. Patau's syndrome, C. Down's syndrome, D. Klinefelter's syndrome
B: Patau's syndrome
Answer: B: Patau's syndrome 
Explanation: Trisomy 13 = Patau's syndrome Trisomy 18 = Edward's syndrome Trisomy 21 = Down's syndrome Extra X chromosome = Klinefelter syndrome( 47 XXY)