Question: when did the first man and woman come to britain
[{'answer': '40,000 years ago', 'provenance': [{'wikipedia_id': '448467', 'title': 'Prehistoric Britain', 'start_paragraph_id': 2, 'start_character': 942, 'end_paragraph_id': 2, 'end_character': 958, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '448467', 'title': 'Prehistoric Britain', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 1346, 'bleu_score': 0.9624142435392301, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14234364351217418180}, 'section': 'Section::::Abstract.'}]}]