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: Social & Preventive Medicine
[{'content': 'The most common side effect of IUD insertion is - \nSelect and explain. \nA. Bleeding, B. Pain, C. Pelvic, D. Ectopic pregnancy', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Most common side effect → Bleeding\nMost common side effect requiring removal of the device → Pain', 'role': 'assistant'}]