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_name_27 ( pollutant VARCHAR, regulatory_citation VARCHAR, type VARCHAR )

### Question ###
what is the polluntant when the regulatory citation is 40 cfr 50.7(a) and the type is primary?

### Accurate SQL ###

SELECT pollutant FROM table_name_27 WHERE regulatory_citation = "40 cfr 50.7(a)" AND type = "primary"