What is the branding for the station with a frequency of 93.1mhz and a callsign of DWRX?
CREATE TABLE "monster_radio_stations" (
  "branding" text,
  "callsign" text,
  "frequency" text,
  "power_k_w" text,
  "coverage" text
);
SELECT "branding" FROM "monster_radio_stations" WHERE "frequency"='93.1mhz' AND "callsign"='dwrx';