Question: who is the president of usa right now
[{'answer': 'Donald Trump', 'provenance': [{'wikipedia_id': '24113', 'title': 'President of the United States', 'start_paragraph_id': 5, 'start_character': 0, 'end_paragraph_id': 5, 'end_character': 12, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '24113', 'title': 'President of the United States', 'section': 'Section::::Abstract.', 'start_paragraph_id': 5, 'end_paragraph_id': 5, 'meta': {'evidence_span': ['Donald Trump of New York is the 45th and current president of the United States. He assumed office on January 20, 2017.', 'Donald Trump of New York is the 45th and current president of the United States. He assumed office on January 20, 2017.', 'Donald Trump of New York is the 45th and current president of the United States']}}]}]