CREATE TABLE table_53846 ("Species" TEXT, "Strain" TEXT, "Type" TEXT, "Base Pairs" FLOAT, "Genes" FLOAT)

What is the largest base pair with a Strain of unspecified?
SELECT MAX("Base Pairs") FROM table_53846 WHERE "Strain" = 'unspecified'
SELECT MAX("Base Pairs") FROM "table_53846" WHERE "Strain" = 'unspecified'