A patient presents in the winter months with swollen lips. The patient says they forgot their lip balm. Uncontrolled activation of the classical complement pathway is responsible for the swelling. Records show the patient has a C1 inh deficiency. Which of the following does this patient have?

Correct Answer: C

Rationale: Hereditary angioedema results from C1 inhibitor deficiency, causing uncontrolled complement activation and swelling.

Correct Answer: C

Rationale: Helminth infections, such as Onchocerca volvulus, typically induce a Th2 response, which is critical for combating extracellular parasites through the activation of eosinophils and production of IgE.

Correct Answer: C

Rationale: The Fab fragment, produced by papain digestion, retains the antigen-binding site of an antibody, consisting of one light chain and part of a heavy chain.

Correct Answer: B

Rationale: Immune surveillance describes the immune system's role in recognizing and eliminating tumor cells.

Correct Answer: D

Rationale: Anaphylaxis is triggered by allergen-induced cross-linking of IgE on mast cells, leading to degranulation and histamine release.