Question: what is the theme of the 2018 world health day whd
[{'answer': 'Universal Health Coverage', 'provenance': [{'wikipedia_id': '1734336', 'title': 'World Health Day', 'start_paragraph_id': 32, 'start_character': 18, 'end_paragraph_id': 32, 'end_character': 43, 'bleu_score': 1.0, 'section': 'Section::::List of World Health Days themes.\n'}]}, {'provenance': [{'wikipedia_id': '1734336', 'title': 'World Health Day', 'start_paragraph_id': 32, 'start_character': 0, 'end_paragraph_id': 32, 'end_character': 43, 'bleu_score': 0.5081327481546141, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10009674169884802609}, 'section': 'Section::::List of World Health Days themes.\n'}]}]