Question: the dark tower series is centred around a character who is known as a
[{'answer': 'gunslinger', 'provenance': [{'wikipedia_id': '6075690', 'title': 'List of The Dark Tower characters', 'start_paragraph_id': 5, 'start_character': 117, 'end_paragraph_id': 5, 'end_character': 127, 'bleu_score': 1.0, 'section': 'Section::::Protagonists.:Ka-tet of the Nineteen and/or Ninety and Nine.:Roland Deschain.\n'}]}, {'provenance': [{'wikipedia_id': '6075690', 'title': 'List of The Dark Tower characters', 'start_paragraph_id': 5, 'start_character': 0, 'end_paragraph_id': 5, 'end_character': 626, 'bleu_score': 0.9829771687435411, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9949922525155649255}, 'section': 'Section::::Protagonists.:Ka-tet of the Nineteen and/or Ninety and Nine.:Roland Deschain.\n'}]}]