text: {"answer": "s", "query": "What letter is displayed on this poster?", "question_id": 6854000, "contrast_sets": [{"mutex_answer": "e", "mutex_caption": "a picture of the letter e and a sandwich"}, {"mutex_answer": "p", "mutex_caption": "a picture of the letter p and a sandwich"}, {"mutex_answer": "b", "mutex_caption": "a picture of the letter b and a sandwich"}, {"mutex_answer": "m", "mutex_caption": "a picture of the letter m and a sandwich"}, {"mutex_answer": "a", "mutex_caption": "a picture of the letter a and a sandwich"}], "caption": "a picture of the letter s and a sandwich", "image_id": 6854, "id": 615, "file_name": "COCO_val2014_000000006854.jpg", "coco_url": "http://images.cocodataset.org/val2014/COCO_val2014_000000006854.jpg", "flickr_url": "http://farm3.staticflickr.com/2277/2082789963_6a11311199_z.jpg", "license": 1, "height": 500, "width": 375}