Question: who won the most nba finals in a row
[{'answer': 'Boston Celtics', 'provenance': [{'wikipedia_id': '890793', 'title': 'NBA Finals', 'start_paragraph_id': 4, 'start_character': 96, 'end_paragraph_id': 4, 'end_character': 110, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '890793', 'title': 'NBA Finals', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 490, 'bleu_score': 0.714970873883484, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15127355545274400913}, 'section': 'Section::::Abstract.'}]}]