Final answer:
Contact dermatitis involves a cytotoxic hypersensitivity reaction, where the immune system attacks body cells mistaken as foreign due to the presence of a certain antigen. Therefore, the correct option is b.
Step-by-step explanation:
The condition that involves a cytotoxic hypersensitivity reaction is Contact dermatitis. Cytotoxic hypersensitivity reactions are mediated by T lymphocytes and occur when the immune system attacks and destroys body cells that it mistakenly identifies as foreign due to the presence of a certain antigen. This type of reaction is represented in cases of contact dermatitis, where an allergen, such as nickel or poison ivy, leads to skin irritation upon contact with previously sensitized individuals. In these cases, CD8 cytotoxic T cells are activated and cause tissue damage as a response to the foreign antigen.