This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Gynaecology & Obstetrics
Ball's operation is done for : 
Select and explain. 
A. Ca. Cx, B. Ca. Ovary, C. Ca. Fallopian tube, D. Pruritus vulvae
D: Pruritus vulvae
Answer: D: Pruritus vulvae 
Explanation: Pruritus vulvae