Question: when did the raspberry pi 3 b+ come out
[{'answer': '14 March 2018', 'provenance': [{'wikipedia_id': '31692117', 'title': 'Raspberry Pi', 'start_paragraph_id': 206, 'start_character': 12, 'end_paragraph_id': 206, 'end_character': 25, 'bleu_score': 1.0, 'section': 'Section::::History.:Post-launch.\n'}]}]