Question: when did nepal established diplomatic relation with britain
[{'answer': '1923 December 21', 'provenance': [{'wikipedia_id': '37629793', 'title': 'Nepal–Britain Treaty of 1923', 'start_paragraph_id': 1, 'start_character': 187, 'end_paragraph_id': 1, 'end_character': 203, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '37629793', 'title': 'Nepal–Britain Treaty of 1923', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 535, 'bleu_score': 0.979484453366057, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14179300306054629996}, 'section': 'Section::::Abstract.'}]}]