text: {"answer": "stone", "query": "What kind of wall are the horses behind?", "question_id": 274298001, "contrast_sets": [{"mutex_answer": "brick", "mutex_caption": "Two horses in a field by a brick fence."}, {"mutex_answer": "rock", "mutex_caption": "Two horses in a field by a rock fence."}, {"mutex_answer": "concrete", "mutex_caption": "Two horses in a field by a concrete fence."}], "caption": "Two horses in a field by a stone fence.", "image_id": 274298, "id": 500, "file_name": "COCO_val2014_000000274298.jpg", "coco_url": "http://images.cocodataset.org/val2014/COCO_val2014_000000274298.jpg", "flickr_url": "http://farm9.staticflickr.com/8365/8506483029_583e67cec4_z.jpg", "license": 3, "height": 427, "width": 640}