Which one is wrong about the statement of protein putrefaction?

A、Most products of protein putrefaction are harmful to human health.;
B、Protein putrefaction occurs in the large intestine.;
C、Some of the products of protein putrefaction are beneficial to human body.;
D、Protein putrefaction includes deamination and decarboxylation reaction, etc.;
E、It is the decomposition of undigested proteins and unabsorbed amino acids by large intestinal epithelial cells.