Question: when was sugauli treaty signed between britain india and nepal
[{'answer': '2 December 1815', 'provenance': [{'wikipedia_id': '1230572', 'title': 'Treaty of Sugauli', 'start_paragraph_id': 8, 'start_character': 138, 'end_paragraph_id': 8, 'end_character': 153, 'bleu_score': 1.0, 'section': 'Section::::Terms.\n'}]}, {'provenance': [{'wikipedia_id': '1230572', 'title': 'Treaty of Sugauli', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 848, 'bleu_score': 0.9415332868646721, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11371676411863774012}, 'section': 'Section::::Abstract.'}]}]