Question: last time yale won a national championship in lacrosse
[{'answer': 'May 28 , 2018', 'provenance': [{'wikipedia_id': '27511211', 'title': "Yale Bulldogs men's lacrosse", 'start_paragraph_id': 2, 'start_character': 3, 'end_paragraph_id': 2, 'end_character': 16, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '27511211', 'title': "Yale Bulldogs men's lacrosse", 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 126, 'bleu_score': 0.910879922930628, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17295581847805304287}, 'section': 'Section::::Abstract.'}]}]