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': 'The most common side effect of IUCD inseion is: \nSelect and explain. \nA. Bleeding., B. Pain., C. Pelvic infection., D. Ectopic pregnancy.', 'role': 'user'}, {'content': "Answer: A \nExplanation: Side effects of IUCD Bleeding Most common side effect Tranexamic acid and NSAIDS and are given for the first 3 cycles during periods Best time of Inseion of IUCD within Last days of Periods Pain( Most common reason for removal) Infection PID's (Should be Ruled out before Inseing IUCD) Perforation(Rare)", 'role': 'assistant'}]