Question: what's the price of a us postage stamp
[{'answer': '49 cents', 'provenance': [{'wikipedia_id': '270009', 'title': 'Postage stamps and postal history of the United States', 'start_paragraph_id': 140, 'start_character': 90, 'end_paragraph_id': 140, 'end_character': 98, 'bleu_score': 1.0, 'section': 'Section::::Modern U.S. stamps.\n'}]}, {'provenance': [{'wikipedia_id': '270009', 'title': 'Postage stamps and postal history of the United States', 'start_paragraph_id': 140, 'start_character': 0, 'end_paragraph_id': 140, 'end_character': 170, 'bleu_score': 0.929712191543383, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3000914772782807030}, 'section': 'Section::::Modern U.S. stamps.\n'}]}]