Question: when did pubg come out on steam early access
[{'answer': 'March 2017', 'provenance': [{'wikipedia_id': '53318656', 'title': "PlayerUnknown's Battlegrounds", 'start_paragraph_id': 2, 'start_character': 98, 'end_paragraph_id': 2, 'end_character': 108, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]