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': 'All of the following are mechanisms of action of emergency contraception, EXCEPT: \nSelect and explain. \nA. Delaying ovulation, B. Inhibiting feilization, C. Interrupting early pregnancy, D. Preventing implantation of feilized egg', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Mechanism of action of emergency contraception or post coital contraception includes : prevention or producing a delay of ovulation by taking the drug in the beginning of cycle, interfering with the process of feilization, prevention of implantation by rendering the endometrium unorable and by interfering with the function of corpus luteum. Ref: Textbook of Obstetrics By D.C. Dutta, 6th Edition, Page 549', 'role': 'assistant'}]