Question: who plays batman in the movie justice league
[{'answer': 'Ben Affleck', 'provenance': [{'wikipedia_id': '44120383', 'title': 'Justice League (film)', 'start_paragraph_id': 1, 'start_character': 360, 'end_paragraph_id': 1, 'end_character': 371, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '44120383', 'title': 'Justice League (film)', 'start_paragraph_id': 11, 'start_character': 0, 'end_paragraph_id': 11, 'end_character': 259, 'bleu_score': 0.948006874591591, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7170879029874347567}, 'section': 'Section::::Cast.\n'}]}]