Question: who has won the most afl grand finals in a row
[{'answer': 'Collingwood', 'provenance': [{'wikipedia_id': '87216', 'title': 'List of VFL/AFL premiers', 'start_paragraph_id': 29, 'start_character': 17, 'end_paragraph_id': 29, 'end_character': 28, 'bleu_score': 1.0, 'section': 'Section::::Minor grade premierships.:VFL/AFL Reserves premierships.\n'}]}]