Question: who's the main character in attack on titan
[{'answer': 'Eren Yeager', 'provenance': [{'wikipedia_id': '39395821', 'title': 'List of Attack on Titan characters', 'start_paragraph_id': 1, 'start_character': 333, 'end_paragraph_id': 1, 'end_character': 344, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '39395821', 'title': 'List of Attack on Titan characters', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 693, 'bleu_score': 0.9822204502117851, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5296952326637924033}, 'section': 'Section::::Abstract.'}]}]