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: Gynaecology & Obstetrics
[{'content': 'Intermenstrual bleeding is frequent side effect seen with \nSelect and explain. \nA. Progestin-only pills during early months of use., B. Combined OCPs throughout use., C. Progestin-only pills resultant AUB never occurs., D. Combined OCPs during early months of use.', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Intermenstrual bleeding is frequent with progestin - only pills throughout use and with combined OCPs during early months of use.', 'role': 'assistant'}]