Question: when was toilet paper invented in ancient china
[{'answer': 'the 6th century AD', 'provenance': [{'wikipedia_id': '37993', 'title': 'Toilet paper', 'start_paragraph_id': 2, 'start_character': 59, 'end_paragraph_id': 2, 'end_character': 77, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '37993', 'title': 'Toilet paper', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 304, 'bleu_score': 0.9019629427251671, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2898089607359022318}, 'section': 'Section::::History.\n'}]}]