Question: what is apple's latest operating system called
[{'answer': 'macOS Mojave', 'provenance': [{'wikipedia_id': '20640', 'title': 'MacOS', 'start_paragraph_id': 2, 'start_character': 726, 'end_paragraph_id': 2, 'end_character': 738, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '20640', 'title': 'MacOS', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 785, 'bleu_score': 0.985238839858627, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4958826956592523532}, 'section': 'Section::::Abstract.'}]}]