Question: who held thor's hammer in avengers 2
[{'answer': 'Thor', 'provenance': [{'wikipedia_id': '2016182', 'title': 'Mjolnir (comics)', 'start_paragraph_id': 1, 'start_character': 162, 'end_paragraph_id': 1, 'end_character': 166, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]