Which of the following is toxic to living tissues and should only be used for nonliving surfaces?
a. Antiseptics
b. Antigens
c. Disinfectants
d. Aseptic agents
c
Rationale: a. Antiseptic agents are not toxic to living tissues and are used to cleanse skin.
b. Antigens are proteins found on living tissues.
c. Correct.
d. Asepsis refers to an environment free of pathogens.
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