CREATE TABLE table_name_27 (pollutant VARCHAR, regulatory_citation VARCHAR, type VARCHAR)

what is the polluntant when the regulatory citation is 40 cfr 50.7(a) and the type is primary?
SELECT pollutant FROM table_name_27 WHERE regulatory_citation = "40 cfr 50.7(a)" AND type = "primary"
SELECT "pollutant" FROM "table_name_27" WHERE "40 cfr 50.7(a)" = "regulatory_citation" AND "primary" = "type"