Write SQL query to solve given problem: Name the object class of the image with lowest bounding box.. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT T2.OBJ_CLASS FROM IMG_OBJ AS T1 INNER JOIN OBJ_CLASSES AS T2 ON T1.OBJ_CLASS_ID = T2.OBJ_CLASS_ID ORDER BY T1.H LIMIT 1