Question: who do the avengers fight in the first movie
[{'answer': 'the Chitauri', 'provenance': [{'wikipedia_id': '22114132', 'title': 'The Avengers (2012 film)', 'start_paragraph_id': 6, 'start_character': 89, 'end_paragraph_id': 6, 'end_character': 101, 'bleu_score': 1.0, 'section': 'Section::::Plot.\n'}]}, {'answer': 'Loki', 'provenance': [{'wikipedia_id': '22114132', 'title': 'The Avengers (2012 film)', 'start_paragraph_id': 1, 'start_character': 861, 'end_paragraph_id': 1, 'end_character': 865, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '22114132', 'title': 'The Avengers (2012 film)', 'start_paragraph_id': 10, 'start_character': 0, 'end_paragraph_id': 10, 'end_character': 1089, 'bleu_score': 0.963927803902043, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17952676092164141985}, 'section': 'Section::::Plot.\n'}]}]