Question: when was who wants to be a millionaire started
[{'answer': '4 September 1998', 'provenance': [{'wikipedia_id': '38156', 'title': 'Who Wants to Be a Millionaire?', 'start_paragraph_id': 2, 'start_character': 40, 'end_paragraph_id': 2, 'end_character': 56, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]