Question: who is the current poet laureate of the united states
[{'answer': 'Tracy K. Smith', 'provenance': [{'wikipedia_id': '34739128', 'title': 'United States Poet Laureate', 'start_paragraph_id': 62, 'start_character': 23, 'end_paragraph_id': 62, 'end_character': 36, 'bleu_score': 1.0, 'section': 'Section::::Lists of appointees.:Poet Laureate Consultants in Poetry.\n'}]}]