Question: who wrote the song four dead in ohio
[{'answer': 'Neil Young', 'provenance': [{'wikipedia_id': '30862678', 'title': 'Ohio (Crosby, Stills, Nash & Young song)', 'start_paragraph_id': 1, 'start_character': 75, 'end_paragraph_id': 1, 'end_character': 85, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '30862678', 'title': 'Ohio (Crosby, Stills, Nash & Young song)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 691, 'bleu_score': 0.9637269136610731, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9247476873037476778}, 'section': 'Section::::Abstract.'}]}]