Question: what is the meaning of the bull in wall street
[{'answer': 'aggressive financial optimism and prosperity', 'provenance': [{'wikipedia_id': '446394', 'title': 'Charging Bull', 'start_paragraph_id': 5, 'start_character': 98, 'end_paragraph_id': 5, 'end_character': 142, 'bleu_score': 1.0, 'section': 'Section::::Description.\n'}]}, {'provenance': [{'wikipedia_id': '446394', 'title': 'Charging Bull', 'start_paragraph_id': 5, 'start_character': 0, 'end_paragraph_id': 5, 'end_character': 444, 'bleu_score': 0.799135676030238, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10363986699192875252}, 'section': 'Section::::Description.\n'}]}]