CREATE TABLE table_43369 ("Season" CLOB, "Competition" CLOB, "Round" CLOB, "Opponent" CLOB, "Series" CLOB)

What is the Season when the Opponent was zenit st. petersburg?
SELECT "Season" FROM table_43369 WHERE "Opponent" = 'zenit st. petersburg'
SELECT "Season" FROM "table_43369" WHERE "Opponent" = 'zenit st. petersburg'