Write SQL query to solve given problem: To which predicted relation class does the self-relation of the object sample in image no.5 belong?. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT T1.PRED_CLASS FROM PRED_CLASSES AS T1 INNER JOIN IMG_REL AS T2 ON T1.PRED_CLASS_ID = T2.PRED_CLASS_ID WHERE T2.IMG_ID = 5 AND T2.OBJ1_SAMPLE_ID = T2.OBJ2_SAMPLE_ID