题目选项分析

Treating meat with irradiation kills many bacteria that can cause illness but it also triggers chemical decompositions. These decompositions produce substances that can cause cancer. Thorough cooking kills the same bacteria in meat as does irradiation treatment. Therefore, to minimize health risks, meat should be cooked thoroughly rather than treated with irradiation. Which of the following, if true, most seriously weakens the argument above?

【选项】Not all of the substances produced by the chemical decompositions triggered by irradiation are potentially carcinogenic.