Parthenium hysterophorus is commonly called as congress grass or gajar ghass .It is a species of flowering plant in the aster family, Asteraceae. It is native to the American tropics. This weed is equally dangerous for all flora and fauna. It is highly dangerous for humans. It utilizes most of the nutritious substances from soils, thus converting fertile ground into unfertile ones.
So the correct answer is 'Parthenium hysterophorus'