CREATE TABLE table_43168 ("Name" TEXT, "Position" TEXT, "Number" TEXT, "School/Club Team" TEXT, "Season" TEXT, "Acquisition via" TEXT)

What is the Season with an Acquisition via of rookie draft, and the number is 15?
SELECT "Season" FROM table_43168 WHERE "Acquisition via" = 'rookie draft' AND "Number" = '15'
SELECT "Season" FROM "table_43168" WHERE "Acquisition via" = 'rookie draft' AND "Number" = '15'