Question: when was abbott and costello who's on first
[{'answer': 'February 1938', 'provenance': [{'wikipedia_id': '106089', 'title': "Who's on First?", 'start_paragraph_id': 5, 'start_character': 3, 'end_paragraph_id': 5, 'end_character': 16, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '106089', 'title': "Who's on First?", 'start_paragraph_id': 5, 'start_character': 0, 'end_paragraph_id': 5, 'end_character': 865, 'bleu_score': 0.9507296132124721, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13475911189157719251}, 'section': 'Section::::History.\n'}]}]