Question: what is the prevalent wind flow in the tropics
[{'answer': 'easterly surface winds', 'provenance': [{'wikipedia_id': '786064', 'title': 'Prevailing winds', 'start_paragraph_id': 7, 'start_character': 67, 'end_paragraph_id': 7, 'end_character': 89, 'bleu_score': 1.0, 'section': 'Section::::Climatology.:Trades and their impact.\n'}]}, {'provenance': [{'wikipedia_id': '786064', 'title': 'Prevailing winds', 'start_paragraph_id': 7, 'start_character': 0, 'end_paragraph_id': 7, 'end_character': 567, 'bleu_score': 0.978138775770484, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17233736531564862597}, 'section': 'Section::::Climatology.:Trades and their impact.\n'}]}]