Question: when did the lakers play the celtics in the finals
[{'answer': '2010', 'provenance': [{'wikipedia_id': '1931138', 'title': 'Celtics–Lakers rivalry', 'start_paragraph_id': 1, 'start_character': 562, 'end_paragraph_id': 1, 'end_character': 566, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]