Question: who is the mars rover sojourner named after
[{'answer': 'Sojourner Truth', 'provenance': [{'wikipedia_id': '36694809', 'title': 'Sojourner (rover)', 'start_paragraph_id': 4, 'start_character': 183, 'end_paragraph_id': 4, 'end_character': 198, 'bleu_score': 1.0, 'section': 'Section::::Overview.\n'}]}, {'provenance': [{'wikipedia_id': '36694809', 'title': 'Sojourner (rover)', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 537, 'bleu_score': 0.620159405241209, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14700511888525119651}, 'section': 'Section::::Overview.\n'}]}]