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'
What are the description and credit of the course which the student whose last name is Smithson took?
CREATE TABLE student (
    stu_num VARCHAR,
    stu_lname VARCHAR
)

CREATE TABLE enroll (
    class_code VARCHAR,
    stu_num VARCHAR
)

CREATE TABLE CLASS (
    class_code VARCHAR,
    crs_code VARCHAR
)

CREATE TABLE course (
    crs_description VARCHAR,
    crs_credit VARCHAR,
    crs_code VARCHAR
)