text: {"answer": "train", "query": "What are they riding on?", "question_id": 528595000, "contrast_sets": [{"mutex_answer": "caboose", "mutex_caption": "A group of people including children and adults are riding on a small caboose.", "mutex_detection": "caboose"}, {"mutex_answer": "sleigh", "mutex_caption": "A group of people including children and adults are riding on a small sleigh.", "mutex_detection": "sleigh"}], "caption": "A group of people including children and adults are riding on a small train.", "image_id": 528595, "detection": "train", "boxes": [[28.44, 190.81, 455.12, 220.45]], "id": 304, "file_name": "COCO_val2014_000000528595.jpg", "coco_url": "http://images.cocodataset.org/val2014/COCO_val2014_000000528595.jpg", "flickr_url": "http://farm8.staticflickr.com/7421/9505714232_06ceedc81b_z.jpg", "license": 4, "height": 480, "width": 640}