Question: what caliber do they use in the biathlon in the olympics
[{'answer': '. 22 LR'}, {'provenance': [{'wikipedia_id': '4405', 'title': 'Biathlon', 'start_paragraph_id': 37, 'start_character': 0, 'end_paragraph_id': 37, 'end_character': 326, 'bleu_score': 0.6871077196085451, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13213904297969513457}, 'section': 'Section::::Rules and equipment.:Shooting details.\n'}]}]