Question: when is the last time the yankees and the dodgers played in the world series
[{'answer': '1981', 'provenance': [{'wikipedia_id': '6641267', 'title': 'Dodgers–Yankees rivalry', 'start_paragraph_id': 26, 'start_character': 53, 'end_paragraph_id': 26, 'end_character': 57, 'bleu_score': 1.0, 'section': 'Section::::Dodgers move to Los Angeles.:1963: Los Angeles Dodger win.\n'}]}]