Question: where do most of australia's tourists come from
[{'answer': 'China', 'provenance': [{'wikipedia_id': '274784', 'title': 'Tourism in Australia', 'start_paragraph_id': 6, 'start_character': 266, 'end_paragraph_id': 6, 'end_character': 271, 'bleu_score': 1.0, 'section': 'Section::::Trends.\n'}]}]