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': 'Not a barrier contraceptive among the following is \nSelect and explain. \nA. Diaphragm, B. Condom, C. Today, D. Centchroman', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Centchroman \n\nNon-hormonal contraceptive pill\nIt is a selective estrogen receptor modulator', 'role': 'assistant'}]