Question: who played worf on star trek the next generation
[{'answer': 'Michael Dorn', 'provenance': [{'wikipedia_id': '303322', 'title': 'Michael Dorn', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 12, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '303322', 'title': 'Michael Dorn', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 149, 'bleu_score': 0.929712191543383, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8102641347527968659}, 'section': 'Section::::Abstract.'}]}]