CREATE TABLE table_25998 ("Province" TEXT, "Mahmoud Ahmadinejad" FLOAT, "Mehdi Karroubi" FLOAT, "Mir-Hossein Mousavi" FLOAT, "Mohsen Rezaee" FLOAT, "Spoiled ballots" FLOAT, "Total votes" FLOAT)

What is the highest score for candidate Mohsen Rezaee when candidate mir-hossein mousavi scored 837858 votes?
SELECT MAX("Mohsen Rezaee") FROM table_25998 WHERE "Mir-Hossein Mousavi" = '837858'
SELECT MAX("Mohsen Rezaee") FROM "table_25998" WHERE "Mir-Hossein Mousavi" = '837858'