text: {"answer": "tennis racket", "query": "What is the man carrying?", "question_id": 502848000, "contrast_sets": [{"mutex_answer": "ball", "mutex_caption": "A man standing on a grass tennis court and holding a tennis ball in his hand.", "mutex_detection": "ball"}], "caption": "A man standing on a grass tennis court and holding a tennis racket in his hand.", "image_id": 502848, "detection": "racket", "boxes": [[237.48, 200.1, 50.79, 37.71]], "id": 1407, "file_name": "COCO_val2014_000000502848.jpg", "coco_url": "http://images.cocodataset.org/val2014/COCO_val2014_000000502848.jpg", "flickr_url": "http://farm5.staticflickr.com/4005/4378494063_f795759495_z.jpg", "license": 7, "height": 500, "width": 455}