Question: who is the u.s.'s biggest trading partner
[{'answer': 'China', 'provenance': [{'wikipedia_id': '9859719', 'title': 'List of the largest trading partners of the United States', 'start_paragraph_id': 12, 'start_character': 52, 'end_paragraph_id': 12, 'end_character': 57, 'bleu_score': 1.0, 'section': 'Section::::See also.\n'}]}]