In the alternative complement pathway, this component molecule undergoes spontaneous activation, which creates a challenge for organ xenotransplantation.

Correct Answer: C

Rationale: C3 spontaneously activates in the alternative pathway, complicating xenotransplantation.

Correct Answer: D

Rationale: Septic shock is characterized by systemic vasodilation leading to hypotension and a compensatory increase in heart rate (tachycardia) to maintain perfusion.

Correct Answer: D

Rationale: Eosinophils are not a major acidic/anionic protein; they are cells with granules containing cationic proteins like major basic protein.

Correct Answer: A

Rationale: The live oral poliovirus vaccine is primarily recommended for children, with adults typically receiving inactivated polio vaccine.

Correct Answer: C

Rationale: CGD affects neutrophil function due to defective NADPH oxidase, impairing microbial killing.