Question: where is the national college championship game played
[{'answer': 'Mercedes - Benz Stadium', 'provenance': [{'wikipedia_id': '48966894', 'title': '2018 College Football Playoff National Championship', 'start_paragraph_id': 20, 'start_character': 227, 'end_paragraph_id': 20, 'end_character': 250, 'bleu_score': 1.0, 'section': 'Section::::Broadcasting.\n'}]}, {'provenance': [{'wikipedia_id': '48966894', 'title': '2018 College Football Playoff National Championship', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 388, 'bleu_score': 0.8450099789576211, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6976516544376321913}, 'section': 'Section::::Abstract.'}]}]