The correct option is D Haem
An enzyme consists of a protein part called apoenzyme and non-protein part called cofactor. The apoenzyme and cofactor together form holoenzyme.
Prosthetic groups are attached to the enzymes permanently and are a type of cofactor. The cofactor present in the microbial enzyme catalase-peroxidase is haem, which is an example of a prosthetic group.
So, the correct answer is Haem.