During an IgG-mediated hypersensitivity reaction, which leukocyte is activated? a. Neutrophils b. Monocytes c. Eosinophils d. T lymphocytes {Ans: c. Eosinophils Of the options provided, only eosinophils are activated during IgE-mediated hypersensitivity reactions. page 263-265}Which class of immunoglobulins forms isohemagglutinins? a. IgA b. IgE c. IgG d. IgM {Ans: d. IgM Exp: Naturally occurring antibodies, called isohemagglutinins, are immunoglobulins of only the IgM class. page 278}Match the descriptions of the skin lesions with the disorder where it is found. 1. Urticaria , allergic reaction 2. Varicella (chickenpox), herpes zoster (shingles) 3. Wart (verruca) or lichen planus 4. Psoriasis or seborrheic and actinic keratoses 5. Nevus (flat mole) a. Elevated irregular-shaped area of cutaneous edema; solid and transient with a variable diameter b. Elevated, firm circumscribed area less than 1 cm in diameter c. Elevated, firm, and rough lesion with a flat top surface greater than 1 cm in diameter d. Flat circumscribed area that is less than 1 cm in diameter e. Elevated circumscribed, superficial lesion filled with serous fluid, less than 1 cm in diameter {Ans: 1 = a Urticaria exhibits elevated, irregular-shaped areas of cutaneous edema. Its lesions are solid and transient with a variable