Question: who plays the title role in the thor films
[{'answer': 'Chris Hemsworth', 'provenance': [{'wikipedia_id': '12673434', 'title': 'Thor (film)', 'start_paragraph_id': 1, 'start_character': 364, 'end_paragraph_id': 1, 'end_character': 379, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '12673434', 'title': 'Thor (film)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 767, 'bleu_score': 0.984062469849008, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9318834053189251756}, 'section': 'Section::::Abstract.'}]}]