Question: when did the pepsi max big one open
[{'answer': '28 May 1994', 'provenance': [{'wikipedia_id': '1749172', 'title': 'Big One (roller coaster)', 'start_paragraph_id': 1, 'start_character': 257, 'end_paragraph_id': 1, 'end_character': 268, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1749172', 'title': 'Big One (roller coaster)', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 708, 'bleu_score': 0.761752188633214, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 574066773805553697}, 'section': 'Section::::History.\n'}]}]