Write SQL query to solve given problem: Please list the classes of all the object samples in image no.1.. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT T1.OBJ_CLASS FROM OBJ_CLASSES AS T1 INNER JOIN IMG_OBJ AS T2 ON T1.OBJ_CLASS_ID = T2.OBJ_CLASS_ID WHERE T2.IMG_ID = 1 GROUP BY T1.OBJ_CLASS