CREATE TABLE table_5568 ("School" TEXT, "Location" TEXT, "Mascot" TEXT, "Enrollment" FLOAT, "IHSAA Class" TEXT, "# / County" TEXT)

How many people enrolled a the school with an IHSAA Class of a, and the trojans as their mascot?
SELECT MIN("Enrollment") FROM table_5568 WHERE "IHSAA Class" = 'a' AND "Mascot" = 'trojans'
SELECT MIN("Enrollment") FROM "table_5568" WHERE "IHSAA Class" = 'a' AND "Mascot" = 'trojans'