Question: when did the nba make players go to college
[{'answer': 'December 2011', 'provenance': [{'wikipedia_id': '20205887', 'title': 'Eligibility for the NBA draft', 'start_paragraph_id': 13, 'start_character': 175, 'end_paragraph_id': 13, 'end_character': 188, 'bleu_score': 1.0, 'section': 'Section::::Later history.\n'}]}, {'provenance': [{'wikipedia_id': '20205887', 'title': 'Eligibility for the NBA draft', 'start_paragraph_id': 13, 'start_character': 0, 'end_paragraph_id': 13, 'end_character': 389, 'bleu_score': 0.708926370504375, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15203575029732616823}, 'section': 'Section::::Later history.\n'}]}]