Method of sterilization which is least effective is -

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occlusion is done by 2 methods and both these methods have high failure rates.Due to high failure rate this method is obsolete nowPomeroy's method has failure rate of 0.4%Laparoscopic sterilization has failure rate 0.6%Fimbriectomy - Permanent sterilization