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': 'Most appropriate contraceptive during first 6 months of Lactating mother : \nSelect and explain. \nA. IUCD, B. Oral pills, C. Progestin pills, D. Rhythm method', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Progestin pills', 'role': 'assistant'}]