Which of the following is not an enzyme?
A
Ribonucleotide reductase
B
Selenium
C
Glutathione peroxidase
D
Carbonic anhydrase
Correct Answer: Glutathione peroxidase
Enzyme is referred to as a substance which acts as a catalyst to bring about a specific biochemical reaction. Ribonucleotide reductase, Glutathione peroxidase, and Carbonic anhydrase are the enzymes. Whereas selenium is not an enzyme but a cofactor, which are referred to as additional non protein chemical component of an enzyme which is required for optimum activity.