Question: when did scotland last win a grand slam
[{'answer': '1990', 'provenance': [{'wikipedia_id': '758049', 'title': 'Scotland national rugby union team', 'start_paragraph_id': 31, 'start_character': 42, 'end_paragraph_id': 31, 'end_character': 46, 'bleu_score': 1.0, 'section': 'Section::::History.:1987–2000.\n'}]}, {'provenance': [{'wikipedia_id': '758049', 'title': 'Scotland national rugby union team', 'start_paragraph_id': 59, 'start_character': 0, 'end_paragraph_id': 59, 'end_character': 504, 'bleu_score': 0.9375874466695201, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3427854948470299307}, 'section': 'Section::::Thistle and the anthem.\n'}]}]