Question: when did over the counter pregnancy tests become available
[{'answer': 'mid-1970s', 'provenance': [{'wikipedia_id': '311410', 'title': 'Pregnancy test', 'start_paragraph_id': 3, 'start_character': 245, 'end_paragraph_id': 3, 'end_character': 254, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]