Question: where was the movie gran torino filmed at
[{'answer': 'Metro Detroit', 'provenance': [{'wikipedia_id': '17016725', 'title': 'Gran Torino', 'start_paragraph_id': 38, 'start_character': 166, 'end_paragraph_id': 38, 'end_character': 179, 'bleu_score': 1.0, 'section': 'Section::::Production.:Selection of Detroit for production and setting.\n'}]}, {'provenance': [{'wikipedia_id': '17016725', 'title': 'Gran Torino', 'start_paragraph_id': 40, 'start_character': 0, 'end_paragraph_id': 40, 'end_character': 640, 'bleu_score': 0.981898582188057, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12648878938773559616}, 'section': 'Section::::Production.:Shooting locations.\n'}]}]