Question: when was the silver claret jug first presented at the open
[{'answer': '1872', 'provenance': [{'wikipedia_id': '1514941', 'title': 'Claret Jug', 'start_paragraph_id': 2, 'start_character': 42, 'end_paragraph_id': 2, 'end_character': 46, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1514941', 'title': 'Claret Jug', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 312, 'bleu_score': 0.9632870032952191, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5887407822369645008}, 'section': 'Section::::Abstract.'}]}]