Question: when did england first get a prime minister
[{'answer': '1721', 'provenance': [{'wikipedia_id': '24150', 'title': 'Prime Minister of the United Kingdom', 'start_paragraph_id': 23, 'start_character': 376, 'end_paragraph_id': 23, 'end_character': 380, 'bleu_score': 1.0, 'section': 'Section::::Foundations.:Standing Order 66.\n'}]}, {'provenance': [{'wikipedia_id': '24150', 'title': 'Prime Minister of the United Kingdom', 'start_paragraph_id': 47, 'start_character': 0, 'end_paragraph_id': 47, 'end_character': 257, 'bleu_score': 0.8138204606647421, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7432050547182872585}, 'section': 'Section::::Early prime ministers.:"First" prime minister.\n'}]}]