Question: what is the title of langston hughes 's first book of poetry
[{'answer': 'The Weary Blues', 'provenance': [{'wikipedia_id': '21814770', 'title': 'Langston Hughes', 'start_paragraph_id': 27, 'start_character': 247, 'end_paragraph_id': 27, 'end_character': 262, 'bleu_score': 1.0, 'section': 'Section::::Career.\n'}]}, {'provenance': [{'wikipedia_id': '21814770', 'title': 'Langston Hughes', 'start_paragraph_id': 27, 'start_character': 0, 'end_paragraph_id': 27, 'end_character': 774, 'bleu_score': 0.983537688954433, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17913216205260098657}, 'section': 'Section::::Career.\n'}]}]