Question: who plays the gunslinger in the dark tower
[{'answer': 'Idris Elba', 'provenance': [{'wikipedia_id': '46883773', 'title': 'The Dark Tower (2017 film)', 'start_paragraph_id': 1, 'start_character': 197, 'end_paragraph_id': 1, 'end_character': 207, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '46883773', 'title': 'The Dark Tower (2017 film)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 482, 'bleu_score': 0.839766152471183, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 66197199088949689}, 'section': 'Section::::Abstract.'}]}]