This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Contraceptives, Subject name: Gynaecology & Obstetrics
[{'content': 'To avoid contraception, DMPA is given: \nSelect and explain. \nA. Monthly, B. 3 Monthly, C. 6 Monthly, D. Yearly', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. is b, i.e. 3 monthlyRef: Jeffcoate 7th/ed, p812; Dutta Obs 6th/ed, p548; Park 20th/ed, p433-434; Leon Speroff 7th/ed, p962-963DMPA i.e. depot medroxyprogesterone acetate (depot provera) and Net en are progesterone only injectable contraceptives', 'role': 'assistant'}]