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
[{'content': 'The following are true related with regards to vasectomy except \nSelect and explain. \nA. Leads to immediate sterility, B. Failure rate is 0.1%, C. Involves ligation and division of spermatic cord, D. Partner (wife may be given DMPA for 3 months', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Vasectomy consists of dividing and excising a part of vas deferens (with spermatic cord).\nIt leads to permanently ending fertility fo men.\nFailure rate 0.15%.\nThe sterility does not occur immediately after vasectomy. Sperms remain in semen for 15–20 ejaculations which is approximately 3–4 months, during which time an additional contraceptive method (condom by male or DMPA by wife should be used).', 'role': 'assistant'}]