Question: who won the most mvp awards in nba
[{'answer': 'Kareem Abdul - Jabbar', 'provenance': [{'wikipedia_id': '631870', 'title': 'NBA Most Valuable Player Award', 'start_paragraph_id': 3, 'start_character': 127, 'end_paragraph_id': 3, 'end_character': 150, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]