Question: which team has won the most ipl trophy
[{'answer': 'Mumbai Indians', 'provenance': [{'wikipedia_id': '49043267', 'title': 'List of Indian Premier League seasons and results', 'start_paragraph_id': 2, 'start_character': 281, 'end_paragraph_id': 2, 'end_character': 295, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]