This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Genetics of Common Disorders, Subject name: Pediatrics
Turner's syndrome karyotyping is - 
Select and explain. 
A. XXY, B. XO, C. XXX, D. Trisomy 21
B: XO
Answer: B: XO 
Explanation: Ans. is 'b' i.e., XOTrisomy 13- Patau syndromeTrisomy 18- Edward syndromeTrisomy 21- Down syndromeXO- Turner syndromeXXY- Klinefelter syndrome