Question: when did the doctor start using a sonic screwdriver
[{'answer': '1968', 'provenance': [{'wikipedia_id': '27612', 'title': 'Sonic screwdriver', 'start_paragraph_id': 2, 'start_character': 46, 'end_paragraph_id': 2, 'end_character': 50, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '27612', 'title': 'Sonic screwdriver', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 488, 'bleu_score': 0.977139080690077, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7502897170579149380}, 'section': 'Section::::Abstract.'}]}]