There is a table courses with columns: student and class

Please list out all classes which have more than or equal to 5 students.

For example, the table:

+---------+------------+

| student | class      |

+---------+------------+

| A       | Math       |

| B       | English    |

| C       | Math       |

| D       | Biology    |

| E       | Math       |

| F       | Computer   |

| G       | Math       |

| H       | Math       |

| I       | Math       |

+---------+------------+

Should output:

+---------+

| class   |

+---------+

| Math    |

+---------+

# Write your MySQL query statement below

select courses_cnt.class from (select count(DISTINCT student)as cnt,class from courses where 1=1 group by class) as courses_cnt where courses_cnt.cnt >= 5