Question: when did pregnancy tests over the counter became available
[{'answer': '1977', 'provenance': [{'wikipedia_id': '311410', 'title': 'Pregnancy test', 'start_paragraph_id': 28, 'start_character': 293, 'end_paragraph_id': 28, 'end_character': 297, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '311410', 'title': 'Pregnancy test', 'start_paragraph_id': 28, 'start_character': 0, 'end_paragraph_id': 28, 'end_character': 435, 'bleu_score': 0.9720210313175831, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6340962925697716424}, 'section': 'Section::::History.\n'}]}]