Question: What are the description and credit of the course which the student whose last name is Smithson took?
SQL: SELECT T4.crs_description ,  T4.crs_credit FROM CLASS AS T1 JOIN enroll AS T2 ON T1.class_code  =  T2.class_code JOIN student AS T3 ON T3.stu_num  =  T2.stu_num JOIN course AS T4 ON T4.crs_code  =  T1.crs_code WHERE T3.stu_lname  =  'Smithson'