CREATE TABLE table_25737 ("Season" TEXT, "Oberbayern A" TEXT, "Oberbayern B" TEXT, "Niederbayern" TEXT, "Schwaben" TEXT, "Oberpfalz" TEXT)

When spvgg vohenstrau is the oberpfalz what is the season?
SELECT "Season" FROM table_25737 WHERE "Oberpfalz" = 'SpVgg Vohenstrauß'
SELECT "Season" FROM "table_25737" WHERE "Oberpfalz" = 'SpVgg Vohenstrauß'