Question: who led the civil right movement in the usa
[{'answer': 'Martin Luther King Jr. ,', 'provenance': [{'wikipedia_id': '49001', 'title': 'Civil rights movement', 'start_paragraph_id': 223, 'start_character': 4, 'end_paragraph_id': 223, 'end_character': 35, 'bleu_score': 1.0, 'section': 'Section::::Movements, politics, and white reactions.:Black conservatism.\n'}]}, {'provenance': [{'wikipedia_id': '49001', 'title': 'Civil rights movement', 'start_paragraph_id': 5, 'start_character': 0, 'end_paragraph_id': 5, 'end_character': 342, 'bleu_score': 0.8372022246794091, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16357664444304802751}, 'section': 'Section::::Abstract.'}]}]