Question: who won the northern ireland open snooker championship
[{'answer': 'Mark Williams', 'provenance': [{'wikipedia_id': '667308', 'title': 'Northern Ireland Open (snooker)', 'start_paragraph_id': 4, 'start_character': 274, 'end_paragraph_id': 4, 'end_character': 287, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}]