Question: who founded the naacp and what was their purpose
[{'answer': 'W.E.B. Du Bois'}, {'answer': 'Mary White Ovington', 'provenance': [{'wikipedia_id': '25624937', 'title': 'NAACP', 'start_paragraph_id': 1, 'start_character': 243, 'end_paragraph_id': 1, 'end_character': 262, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Moorfield Storey', 'provenance': [{'wikipedia_id': '25624937', 'title': 'NAACP', 'start_paragraph_id': 1, 'start_character': 267, 'end_paragraph_id': 1, 'end_character': 283, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'a bi-racial organization to advance justice for African Americans'}, {'provenance': [{'wikipedia_id': '25624937', 'title': 'NAACP', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 283, 'bleu_score': 0.737956375711856, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12123657827462844337}, 'section': 'Section::::Abstract.'}]}]