This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: FMGE 2018, Subject name: Social & Preventive Medicine
[{'content': 'Highest Contraceptive failure is repoed in \nSelect and explain. \nA. Spermicidal methods, B. Implant, C. Oral contraceptive pills, D. IUD', 'role': 'user'}, {'content': 'Answer: A \nExplanation: - Spermicidal methods has pearl index of 10-25 / HWY ( Highest ). - Contain chemical - Non oxynol 9 - MOA - By rupture of plasma membrane of Acrosomal cap.', 'role': 'assistant'}]