OG11 19

In virtually all types of tissue in every animal species, dioxin induces the production of enzymes that are the organism’s trying to metabolize, or render harmless, the chemical that is irritating it.

(A) trying to metabolize, or render harmless, the chemical that is irritating it

(B) trying that it metabolize, or render harmless, the. chemical irritant

(C) attempt to try to metabolize, or render harmless, such a chemical irritant

(D) attempt to try and metabolize, or render harmless, the chemical irritating it（E）

(E) attempt to metabolize, or render harmless, the chemical irritant

达人，我的意思是题中最后这句the chemical that is irritating it.  中that 后面是补充说明chemical吗？这不是定语从句，可那是什么语法现象呢，谢谢

哦知道了，因为A被排除了所以我根本没看后面....

chemical可以作名词的