CREATE TABLE table_17561 ("Stage" TEXT, "Winner" TEXT, "General classification" TEXT, "Points classification" TEXT, "Mountains classification" TEXT, "Young rider classification" TEXT, "Intergiro classification" TEXT, "Trofeo Fast Team" TEXT)

Who's leading in the general classification in stage 1a?
SELECT "General classification" FROM table_17561 WHERE "Stage" = '1a'
SELECT "General classification" FROM "table_17561" WHERE "Stage" = '1a'