Question: who inventd the first stock ticket in 1867
[{'answer': 'Edward A. Calahan', 'provenance': [{'wikipedia_id': '538123', 'title': 'Ticker tape', 'start_paragraph_id': 3, 'start_character': 60, 'end_paragraph_id': 3, 'end_character': 77, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '538123', 'title': 'Ticker tape', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 124, 'bleu_score': 0.9021315316859231, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16479805659828384401}, 'section': 'Section::::Abstract.'}]}]