text: {"answer": "tracks", "query": "What is the train on?", "question_id": 226820001, "contrast_sets": [{"mutex_answer": "road", "mutex_caption": "a green and black train on a road with smoke coming from the top"}], "caption": "a green and black train on a track with smoke coming from the top", "image_id": 226820, "id": 492, "file_name": "COCO_val2014_000000226820.jpg", "coco_url": "http://images.cocodataset.org/val2014/COCO_val2014_000000226820.jpg", "flickr_url": "http://farm8.staticflickr.com/7439/9658374067_21eeb41d7d_z.jpg", "license": 3, "height": 499, "width": 640}