Question: when did mlb go to 25 man roster
[{'answer': 'In 1968', 'provenance': [{'wikipedia_id': '2346654', 'title': 'Major League Baseball rosters', 'start_paragraph_id': 3, 'start_character': 562, 'end_paragraph_id': 3, 'end_character': 569, 'bleu_score': 1.0, 'section': 'Section::::Active roster.\n'}]}, {'provenance': [{'wikipedia_id': '2346654', 'title': 'Major League Baseball rosters', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 865, 'bleu_score': 0.922000702318819, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3269694209102456832}, 'section': 'Section::::Active roster.\n'}]}]