This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Choriocarcinoma, Subject name: Gynaecology & Obstetrics
Turner syndrome is 
Select and explain. 
A. 45 XO, B. 47 XXY, C. Trisomy 13, D. Trisomy 18
A: 45 XO
Answer: A: 45 XO 
Explanation: Ans. (a) 45 XORef: Shaws 15th ed. H10-111; Harrison 19/e 635; William's Gynecology Ch 16