Question: who were the last 10 prime ministers of england
[{'answer': 'Edward Heath'}, {'answer': 'Harold Wilson'}, {'answer': 'James Callaghan'}, {'answer': 'Margaret Thatcher', 'provenance': [{'wikipedia_id': '2152548', 'title': 'List of Prime Ministers of the United Kingdom', 'start_paragraph_id': 1, 'start_character': 876, 'end_paragraph_id': 1, 'end_character': 893, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'John Major'}, {'answer': 'Tony Blair'}, {'answer': 'Gordon Brown'}, {'answer': 'David Cameron'}, {'answer': 'Theresa May'}]