CREATE TABLE table_34505 ("Rank" FLOAT, "Name" TEXT, "Headquarters" TEXT, "Industry" TEXT, "Market value  (  USD million ) " FLOAT)

What is the lowest rank of Citigroup?
SELECT MIN("Rank") FROM table_34505 WHERE "Name" = 'citigroup'
SELECT MIN("Rank") FROM "table_34505" WHERE "Name" = 'citigroup'