Multiple choice Which of the following is false about PCBs (polychlorinated biphenyls)? They are probable human carcinogens. PCBs cause developmental effects. PCBs cause blisters on skin. Eating fish is the major route of exposure to PCBs. Reveal answer Fill a bubble to check yourself C Correct answer Explanation PCBs do not cause blisters on skin, but they may change the skin pigmentation.