Question: who signed the civil rights act of 1964
[{'answer': 'President Lyndon B. Johnson', 'provenance': [{'wikipedia_id': '188746', 'title': 'Civil Rights Act of 1964', 'start_paragraph_id': 3, 'start_character': 167, 'end_paragraph_id': 3, 'end_character': 194, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '188746', 'title': 'Civil Rights Act of 1964', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 460, 'bleu_score': 0.719026816061754, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10529615020529516030}, 'section': 'Section::::Abstract.'}]}]