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 employee (
    emp_num number,
    emp_lname text,
    emp_fname text,
    emp_initial text,
    emp_jobcode text,
    emp_hiredate time,
    emp_dob time
)

CREATE TABLE enroll (
    class_code text,
    stu_num number,
    enroll_grade text
)

CREATE TABLE student (
    stu_num number,
    stu_lname text,
    stu_fname text,
    stu_init text,
    stu_dob time,
    stu_hrs number,
    stu_class text,
    stu_gpa number,
    stu_transfer number,
    dept_code text,
    stu_phone text,
    prof_num number
)

CREATE TABLE course (
    crs_code text,
    dept_code text,
    crs_description text,
    crs_credit number
)

CREATE TABLE class (
    class_code text,
    crs_code text,
    class_section text,
    class_time text,
    class_room text,
    prof_num number
)

CREATE TABLE professor (
    emp_num number,
    dept_code text,
    prof_office text,
    prof_extension text,
    prof_high_degree text
)

CREATE TABLE department (
    dept_code text,
    dept_name text,
    school_code text,
    emp_num number,
    dept_address text,
    dept_extension text
)