CREATE TABLE table_25286 ("Constituency" TEXT, "Winner" TEXT, "Party" TEXT, "Margin" FLOAT, "Runner-up a" TEXT, "Party a" TEXT)

What is the party when the constituency is 1. Chennai North?
SELECT "Party" FROM table_25286 WHERE "Constituency" = '1. Chennai North'
SELECT "Party" FROM "table_25286" WHERE "Constituency" = '1. Chennai North'