text: {"answer": "truck", "query": "What is the man riding?", "question_id": 400815006, "contrast_sets": [{"mutex_answer": "train", "mutex_caption": "A man sitting in the back of a train.", "mutex_detection": "train"}, {"mutex_answer": "car", "mutex_caption": "A man sitting in the back of a car.", "mutex_detection": "car"}, {"mutex_answer": "bus", "mutex_caption": "A man sitting in the back of a bus.", "mutex_detection": "bus"}, {"mutex_answer": "plane", "mutex_caption": "A man sitting in the back of a plane.", "mutex_detection": "plane"}], "caption": "A man sitting in the back of a truck.", "image_id": 400815, "detection": "truck", "boxes": [[1.11, 0.0, 638.89, 425.89]], "id": 1154, "file_name": "COCO_val2014_000000400815.jpg", "coco_url": "http://images.cocodataset.org/val2014/COCO_val2014_000000400815.jpg", "flickr_url": "http://farm3.staticflickr.com/2423/5751833621_882027b392_z.jpg", "license": 2, "height": 427, "width": 640}