CREATE TABLE table_78180 ("Call sign" CLOB, "Frequency MHz" FLOAT, "City of license" CLOB, "ERP W" FLOAT, "Class" CLOB, "FCC info" CLOB)

What class is the city of black mountain, north carolina?
SELECT "Class" FROM table_78180 WHERE "City of license" = 'black mountain, north carolina'
SELECT "Class" FROM "table_78180" WHERE "City of license" = 'black mountain, north carolina'