Question: what is the seating capacity of mercedes-benz stadium
[{'answer': '71,874', 'provenance': [{'wikipedia_id': '36962066', 'title': 'Mercedes-Benz Stadium', 'start_paragraph_id': 73, 'start_character': 138, 'end_paragraph_id': 73, 'end_character': 143, 'bleu_score': 1.0, 'section': 'Section::::Soccer.\n'}]}]