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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
attempt to metabolize, or render harmless, the chemical irritant
答案是选（D）。
疑问是： harmless是否正确，是否该有副词形式harmlessly。 the chemical irritant 是指代什么？ 这个句子的意思可以翻译一下吗？ 非常感谢！！！ | 
