Question: who played alexander on star trek deep space nine
[{'answer': 'Marc Worden', 'provenance': [{'wikipedia_id': '40844667', 'title': 'List of Star Trek: Deep Space Nine cast members', 'start_paragraph_id': 55, 'start_character': 12, 'end_paragraph_id': 55, 'end_character': 23, 'bleu_score': 1.0, 'section': 'Section::::Cast.:Recurring cast.\n'}]}]