Question: Which image has the highest number of "white" class attributes?
SQL: SELECT T1.IMG_ID AS IMGID FROM IMG_OBJ_att AS T1 INNER JOIN ATT_CLASSES AS T2 ON T1.ATT_CLASS_ID = T2.ATT_CLASS_ID WHERE T2.ATT_CLASS = 'white' GROUP BY T1.IMG_ID ORDER BY COUNT(T1.ATT_CLASS_ID) DESC LIMIT 1