Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_1500146_1 ( scientific_linux_release VARCHAR, delay VARCHAR )

### Question ###
Name the scientific linux release when delay is 28d

### Accurate SQL ###

SELECT scientific_linux_release FROM table_1500146_1 WHERE delay = "28d"