This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Contraception, Subject name: Gynaecology & Obstetrics
Least failure in sterilization occurs with : 
Select and explain. 
A. Falope ring, B. Bipolar cautery, C. Unipolar cauterisation, D. Hulka clip
C: Unipolar cauterisation
Answer: C: Unipolar cauterisation 
Explanation: The success rates are best when clips and rings are used and worst with electrocoagulation. TEXTBOOK OF GYNECOLOGY SHEILA BALAKRISHNAN SECOND EDITION PAGE NO 393