Question: with whom did china conclude the treaty of wanghia
[{'answer': 'United States', 'provenance': [{'wikipedia_id': '3404021', 'title': 'Treaty of Wanghia', 'start_paragraph_id': 1, 'start_character': 171, 'end_paragraph_id': 1, 'end_character': 184, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]