This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Natural Methods, Barrier Methods, IUDs, OCPs, Subject name: Social & Preventive Medicine
[{'content': 'MC side effect of IUCD inseion: \nSelect and explain. \nA. Ectopic pregnancy, B. Pelvic infection, C. Pain, D. Bleeding', 'role': 'user'}, {'content': 'Answer: D \nExplanation: MC side effect bleeding (give to female iron tablet for 2 months). Pain is 2nd mc. but its mc cause of removal of IUCD.', 'role': 'assistant'}]