Question: how many students attend university of texas at austin
[{'answer': 'over 50,000', 'provenance': [{'wikipedia_id': '32031', 'title': 'University of Texas at Austin', 'start_paragraph_id': 1, 'start_character': 429, 'end_paragraph_id': 1, 'end_character': 440, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'over 50,000 undergraduate and graduate students'}, {'answer': '51,331'}, {'answer': '51,331 ( Fall 2016 )'}, {'provenance': [{'wikipedia_id': '32031', 'title': 'University of Texas at Austin', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 510, 'bleu_score': 0.6797801156459341, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4287033966864209766}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '32031', 'title': 'University of Texas at Austin', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ["The institution has the nation's eighth-largest single-campus enrollment, with over 50,000 undergraduate and graduate students and over 24,000 faculty and staff", 'The University of Texas at Austin (UT Austin) is a public research university in Austin, Texas. It was founded in 1883 and is the flagship institution of the University of Texas System. The University of Texas was inducted into the Association of American Universities in 1929, becoming only the third university in the American South to be elected']}}]}]