CREATE TABLE table_78853 ("Rank" FLOAT, "Mountain Peak" TEXT, "Subrange" TEXT, "Elevation" TEXT, "Prominence" TEXT, "Isolation" TEXT)

Name the Rank of Rank Mountain Peak of crested butte pb?
SELECT "Rank" FROM table_78853 WHERE "Mountain Peak" = 'crested butte pb'
SELECT "Rank" FROM "table_78853" WHERE "Mountain Peak" = 'crested butte pb'