Question: who accompanied the prophet on his migration to madinah
[{'answer': 'Abu Bakr', 'provenance': [{'wikipedia_id': '514023', 'title': 'Hegira', 'start_paragraph_id': 1, 'start_character': 376, 'end_paragraph_id': 1, 'end_character': 384, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '514023', 'title': 'Hegira', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 540, 'bleu_score': 0.8155748898359391, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3689176814885023957}, 'section': 'Section::::Abstract.'}]}]