Question: who signed the social security act of 1935
[{'answer': 'President Franklin D. Roosevelt', 'provenance': [{'wikipedia_id': '55815', 'title': 'Social Security Act', 'start_paragraph_id': 1, 'start_character': 107, 'end_paragraph_id': 1, 'end_character': 138, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]