Question: when did men's curling start in the olympics
[{'answer': '1998', 'provenance': [{'wikipedia_id': '3092138', 'title': 'Curling at the Winter Olympics', 'start_paragraph_id': 1, 'start_character': 385, 'end_paragraph_id': 1, 'end_character': 389, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': '1998 Nagano Games', 'provenance': [{'wikipedia_id': '3092138', 'title': 'Curling at the Winter Olympics', 'start_paragraph_id': 1, 'start_character': 385, 'end_paragraph_id': 1, 'end_character': 402, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': '1924', 'provenance': [{'wikipedia_id': '3092138', 'title': 'Curling at the Winter Olympics', 'start_paragraph_id': 1, 'start_character': 77, 'end_paragraph_id': 1, 'end_character': 81, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '3092138', 'title': 'Curling at the Winter Olympics', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 402, 'bleu_score': 0.970362113628587, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6319315434141130284}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '3092138', 'title': 'Curling at the Winter Olympics', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ['1998 Nagano Games.', 'The sport was finally added to the official program for the 1998 Nagano Games.', 'The sport was finally added to the official program for the 1998 Nagano Games.']}}]}]