text: {"answer": "train", "query": "What vehicle is on the bridge?", "question_id": 257887002, "contrast_sets": [{"mutex_answer": "truck", "mutex_caption": "a truck on a train track on an elevated bridge", "mutex_detection": "truck"}, {"mutex_answer": "locomotive", "mutex_caption": "a locomotive on a train track on an elevated bridge", "mutex_detection": "locomotive"}, {"mutex_answer": "trolley", "mutex_caption": "a trolley on a train track on an elevated bridge", "mutex_detection": "trolley"}], "caption": "a train on a train track on an elevated bridge", "image_id": 257887, "detection": "train", "boxes": [[65.93, 298.81, 273.97, 38.52]], "id": 1087, "file_name": "COCO_val2014_000000257887.jpg", "coco_url": "http://images.cocodataset.org/val2014/COCO_val2014_000000257887.jpg", "flickr_url": "http://farm5.staticflickr.com/4088/5047883419_2dd9b4afa2_z.jpg", "license": 1, "height": 381, "width": 640}