Question: who was the first european to reach china
[{'answer': 'A Roman diplomat or merchant', 'provenance': [{'wikipedia_id': '6646612', 'title': 'Chronology of European exploration of Asia', 'start_paragraph_id': 13, 'start_character': 17, 'end_paragraph_id': 13, 'end_character': 45, 'bleu_score': 1.0, 'section': 'Section::::First wave of exploration (mainly by land).:Antiquity.\n'}]}, {'provenance': [{'wikipedia_id': '6646612', 'title': 'Chronology of European exploration of Asia', 'start_paragraph_id': 13, 'start_character': 0, 'end_paragraph_id': 13, 'end_character': 144, 'bleu_score': 0.9146912192286941, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 359457961130283806}, 'section': 'Section::::First wave of exploration (mainly by land).:Antiquity.\n'}]}]