Question: who was the first president to touch social security
[{'answer': 'President Lyndon B. Johnson', 'provenance': [{'wikipedia_id': '35619800', 'title': 'History of Social Security in the United States', 'start_paragraph_id': 44, 'start_character': 85, 'end_paragraph_id': 44, 'end_character': 112, 'bleu_score': 1.0, 'section': 'Section::::Expansion and evolution.:Amendments of the 1950s and 60s.\n'}]}, {'provenance': [{'wikipedia_id': '35619800', 'title': 'History of Social Security in the United States', 'start_paragraph_id': 44, 'start_character': 0, 'end_paragraph_id': 44, 'end_character': 138, 'bleu_score': 0.9181891462193901, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6349527793090839486}, 'section': 'Section::::Expansion and evolution.:Amendments of the 1950s and 60s.\n'}]}]