text: {"answer": "train", "query": "What is the boy riding on?", "question_id": 442942001, "contrast_sets": [{"mutex_answer": "caboose", "mutex_caption": "A miniature caboose in a park full of people.", "mutex_detection": "caboose"}, {"mutex_answer": "sleigh", "mutex_caption": "A miniature sleigh in a park full of people.", "mutex_detection": "sleigh"}], "caption": "A miniature train in a park full of people.", "image_id": 442942, "detection": "train", "boxes": [[406.52, 247.7, 233.48, 133.93]], "id": 207, "file_name": "COCO_val2014_000000442942.jpg", "coco_url": "http://images.cocodataset.org/val2014/COCO_val2014_000000442942.jpg", "flickr_url": "http://farm6.staticflickr.com/5494/9505710728_ff1b11c224_z.jpg", "license": 4, "height": 480, "width": 640}