This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Female Sterilization, Subject name: Gynaecology & Obstetrics
Method of sterilization which is least effective is - 
Select and explain. 
A. Pomeroys technique, B. Laparascopy, C. Vaginal fimbriectomy, D. Hysteroscopic tubal occlusion
D: Hysteroscopic tubal occlusion
Answer: D: Hysteroscopic tubal occlusion 
Explanation: Ans. is 'd' Hysteroscopic tubal occlusion Hysteroscopic tubal occlusion is done by 2 methods and both these methods have high failure rates.Due to high failure rate this method is obsolete nowPomeroy's method has failure rate of 0.4%Laparoscopic sterilization has failure rate 0.6%Fimbriectomy - Permanent sterilization