Question: who betrayed siraj ud daula in the battle of plassey in 1757
[{'answer': 'Jagat Seth', 'provenance': [{'wikipedia_id': '527004', 'title': 'Siraj ud-Daulah', 'start_paragraph_id': 20, 'start_character': 743, 'end_paragraph_id': 20, 'end_character': 753, 'bleu_score': 1.0, 'section': 'Section::::Reign as Nawab.:The Battle of Plassey.\n'}]}, {'answer': 'Mir Jafar', 'provenance': [{'wikipedia_id': '527004', 'title': 'Siraj ud-Daulah', 'start_paragraph_id': 2, 'start_character': 123, 'end_paragraph_id': 2, 'end_character': 132, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Krishna Chandra', 'provenance': [{'wikipedia_id': '527004', 'title': 'Siraj ud-Daulah', 'start_paragraph_id': 20, 'start_character': 766, 'end_paragraph_id': 20, 'end_character': 781, 'bleu_score': 1.0, 'section': 'Section::::Reign as Nawab.:The Battle of Plassey.\n'}]}, {'answer': 'Omichund', 'provenance': [{'wikipedia_id': '527004', 'title': 'Siraj ud-Daulah', 'start_paragraph_id': 14, 'start_character': 536, 'end_paragraph_id': 14, 'end_character': 544, 'bleu_score': 1.0, 'section': 'Section::::Reign as Nawab.:Conspiracy.\n'}]}, {'provenance': [{'wikipedia_id': '527004', 'title': 'Siraj ud-Daulah', 'start_paragraph_id': 20, 'start_character': 0, 'end_paragraph_id': 20, 'end_character': 943, 'bleu_score': 0.7728220452058231, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15058408761652390506}, 'section': 'Section::::Reign as Nawab.:The Battle of Plassey.\n'}]}]