[求助]OG第10版SC 第6题

OG第10版SC 第6题：

6. 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)   attempt to metabolize, or render harmless, the
                chemical irritant

E选项中的 the
                chemical irritant不是很明白是什么意思

请指教～～～～～～