7. What causes cyclic neutropenia?
A) Increased susceptibility to bacterial infections
B) Suppressed production of bactericidal chemicals
C) Low neutrophil count for 3-6 days of a 21-day cycle
D) Mutation in the gene encoding neutrophil esterase

8. Which enzyme is deficient in myeloperoxidase deficiency?
A) Superoxide
B) Myeloperoxidase
C) Hexose monophosphate shunt
D) NADPH oxidase

9. What is the most common cause of secondary immunodeficiencies?
A) Acquired immunodeficiency syndrome (AIDS)
B) Chemotherapy
C) Malnutrition
D) Radiation