Question: who sent the gossip girl blast at blair wedding
[{'answer': 'Dan', 'provenance': [{'wikipedia_id': '31846287', 'title': 'Gossip Girl (season 5)', 'start_paragraph_id': 57, 'start_character': 241, 'end_paragraph_id': 57, 'end_character': 244, 'bleu_score': 1.0, 'section': 'Section::::Production.:Plot.\n'}]}]