Right option is (c) β – galactosidase
Easiest explanation: N-acetyllactosamine is a β-D-galactopyranosyl-(1,6)-2-acetamido-2-deoxy-D-glucose which is synthesized by using β – galactosidase using a carbon-celite column to remove it, as soon as it is formed. Dextransucrase is used to produce dextran from sucrose. Streptokinase is used in the treatment of blood clots and it converts plasminogen to plasmin. Ribonuclease has an antiviral activity that acts by hydrolyzing RNA.