Question: who has won maximum number of ipl titles
[{'answer': 'Mumbai Indians', 'provenance': [{'wikipedia_id': '13260340', 'title': 'Indian Premier League', 'start_paragraph_id': 3, 'start_character': 92, 'end_paragraph_id': 3, 'end_character': 106, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]