Which of the following is an allergen that causes contact dermatitis?

Question

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Urushiol is an allergen found in plants such as poison ivy, poison oak, and poison sumac that causes allergic contact dermatitis. Usnic acid is a lichen-derived compound that can cause phototoxic contact dermatitis. Glochid is a small hair-like structure on the surface of certain cacti that can cause physical irritation, but not necessarily an allergic reaction. Histamine is a chemical released by the body in response to an allergen, but it is not an allergen itself. Pyrethrum is an insecticide derived from chrysanthemum flowers and can cause respiratory irritation, but not typically contact dermatitis.

Which of the Following Is an Allergen That Causes Contact