Question: who is washington addressing in the atlanta exposition
[{'answer': 'a predominantly white audience', 'provenance': [{'wikipedia_id': '2839242', 'title': 'Atlanta Exposition Speech', 'start_paragraph_id': 2, 'start_character': 29, 'end_paragraph_id': 2, 'end_character': 59, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2839242', 'title': 'Atlanta Exposition Speech', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 351, 'bleu_score': 0.9645876452711911, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16342011360198965690}, 'section': 'Section::::Abstract.'}]}]