Question: what season of er did mark greene died
[{'answer': 'Season 8', 'provenance': [{'wikipedia_id': '702722', 'title': 'Mark Greene', 'start_paragraph_id': 1, 'start_character': 389, 'end_paragraph_id': 1, 'end_character': 397, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '702722', 'title': 'Mark Greene', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 452, 'bleu_score': 0.9451526628827591, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1187495581884408954}, 'section': 'Section::::Abstract.'}]}]