This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Contraception, Subject name: Gynaecology & Obstetrics
[{'content': 'Acceptable ontraceptive for lactating mother are all except : \nSelect and explain. \nA. Barrier method, B. Combined OCP, C. Lactational amenorrhoea, D. Progesterone only pill', 'role': 'user'}, {'content': 'Answer: B \nExplanation: In breastfeeding women the POP has no adverse effect on the volume or composition of milk. TEXTBOOK OF GYNECOLOGY SHEILA BALAKRISHNAN SECOND EDITION PAGE NO 370', 'role': 'assistant'}]