Question: when did the mean streak open at cedar point
[{'answer': 'May 5 , 2018', 'provenance': [{'wikipedia_id': '4521048', 'title': 'Steel Vengeance', 'start_paragraph_id': 36, 'start_character': 22, 'end_paragraph_id': 36, 'end_character': 34, 'bleu_score': 1.0, 'section': 'Section::::Incidents.\n'}]}, {'provenance': [{'wikipedia_id': '4521048', 'title': 'Steel Vengeance', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 400, 'bleu_score': 0.9694566079002921, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7645658356461724109}, 'section': 'Section::::Abstract.'}]}]