Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
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?
### Answer:
SELECT pollutant FROM table_name_27 WHERE regulatory_citation = "40 cfr 50.7(a)" AND type = "primary"