Question: when did plan b one step come out
[{'answer': 'April 30 , 2013'}, {'provenance': [{'wikipedia_id': '18939', 'title': 'Emergency contraception', 'start_paragraph_id': 77, 'start_character': 0, 'end_paragraph_id': 77, 'end_character': 543, 'bleu_score': 0.977397480575333, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1739319399875769485}, 'section': 'Section::::History.:United States.:Plan B.\n'}]}]