Question: where did the exxon valdez oil spill happen
[{'answer': 'Prince William Sound , Alaska', 'provenance': [{'wikipedia_id': '10243', 'title': 'Exxon Valdez oil spill', 'start_paragraph_id': 1, 'start_character': 41, 'end_paragraph_id': 1, 'end_character': 70, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]