Who is the host on the series aired on 18 January 2012?
CREATE TABLE "table1_27487310_5" (
  "country" text,
  "name" text,
  "host_s" text,
  "judges" text,
  "network" text,
  "air_dates" text
);
SELECT "host_s" FROM "table1_27487310_5" WHERE "air_dates"='18 January 2012';