Question: when is world water day celebrated and why
[{'answer': '22 March', 'provenance': [{'wikipedia_id': '1552902', 'title': 'World Water Day', 'start_paragraph_id': 1, 'start_character': 58, 'end_paragraph_id': 1, 'end_character': 66, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'to highlight the importance of freshwater'}, {'provenance': [{'wikipedia_id': '1552902', 'title': 'World Water Day', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 482, 'bleu_score': 0.810594454552741, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 228660209976285836}, 'section': 'Section::::Abstract.'}]}]