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
Least effective tuba! sterilization procedure Is : 
Select and explain. 
A. Laparoscopic young's ring method, B. Hysteroscopic occlusion, C. Pomeroy's method, D. Vaginal fimbriectomy
B: Hysteroscopic occlusion
Answer: B: Hysteroscopic occlusion 
Explanation: Hysteroscopic occlusion