Question: how many unesco world heritage sites in uk
[{'answer': '31'}, {'provenance': [{'wikipedia_id': '5738146', 'title': 'List of World Heritage Sites in the United Kingdom', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 823, 'bleu_score': 0.9164961855596461, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14547243938577529299}, 'section': 'Section::::Abstract.'}]}]