Question: what are the names of the avengers characters
[{'answer': 'Tony Stark / Iron Man', 'provenance': [{'wikipedia_id': '22114132', 'title': 'The Avengers (2012 film)', 'start_paragraph_id': 13, 'start_character': 33, 'end_paragraph_id': 13, 'end_character': 53, 'bleu_score': 1.0, 'section': 'Section::::Cast.\n'}]}, {'answer': 'Steve Rogers / Captain America', 'provenance': [{'wikipedia_id': '22114132', 'title': 'The Avengers (2012 film)', 'start_paragraph_id': 14, 'start_character': 27, 'end_paragraph_id': 14, 'end_character': 56, 'bleu_score': 1.0, 'section': 'Section::::Cast.\n'}]}, {'answer': 'Bruce Banner / Hulk', 'provenance': [{'wikipedia_id': '22114132', 'title': 'The Avengers (2012 film)', 'start_paragraph_id': 15, 'start_character': 28, 'end_paragraph_id': 15, 'end_character': 46, 'bleu_score': 1.0, 'section': 'Section::::Cast.\n'}]}, {'answer': 'Thor', 'provenance': [{'wikipedia_id': '22114132', 'title': 'The Avengers (2012 film)', 'start_paragraph_id': 1, 'start_character': 811, 'end_paragraph_id': 1, 'end_character': 815, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Clint Barton / Hawkeye', 'provenance': [{'wikipedia_id': '22114132', 'title': 'The Avengers (2012 film)', 'start_paragraph_id': 18, 'start_character': 29, 'end_paragraph_id': 18, 'end_character': 50, 'bleu_score': 1.0, 'section': 'Section::::Cast.\n'}]}]