Question: when did michael jordan win the national championship
[{'answer': '1998', 'provenance': [{'wikipedia_id': '20455', 'title': 'Michael Jordan', 'start_paragraph_id': 2, 'start_character': 964, 'end_paragraph_id': 2, 'end_character': 968, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]