Question: what is the most current windows server operating system
[{'answer': 'Windows Server 2016', 'provenance': [{'wikipedia_id': '46313839', 'title': 'Windows Server 2016', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 19, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '46313839', 'title': 'Windows Server 2016', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 453, 'bleu_score': 0.850638397081762, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2462787431488200845}, 'section': 'Section::::Abstract.'}]}]