CREATE TABLE table_10408617_5 (bts_retail_price__regulated_ VARCHAR, tariff_code VARCHAR)

What is the regulated retail price for the tariff code ff0 prs?
SELECT bts_retail_price__regulated_ FROM table_10408617_5 WHERE tariff_code = "ff0 PRS"
SELECT "bts_retail_price__regulated_" FROM "table_10408617_5" WHERE "ff0 PRS" = "tariff_code"