A patient encounters the helminth Onchcerca volvulus after swimming in a parasite-infested river in West Africa. Following interaction with the patient's innate immune system, one would expect and hope for the development of which subtype of T cells in response to the organism?

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: 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.

Correct Answer: A

Rationale: B cells and dendritic cells are professional antigen-presenting cells (APCs) that express MHC class II and present antigens to helper T cells.

Correct Answer: D

Rationale: Properdin deficiency, an X-linked condition affecting males, impairs the alternative complement pathway, increasing susceptibility to fatal meningococcal infections. Terminal complement deficiencies (C5-9) also cause neisserial infections but are not sex-linked.