7. Which cell types are affected in Chediak-Higashi syndrome?
A) Leukocytes, blood platelets
B) Red blood cells, leukocytes
C) Helper T cells
D) Neutrophils, macrophages

8. What is the defective enzyme in chronic granulomatous disease?
A) NBT
B) T cells
C) Lysozomal granules
D) NADPH oxidase

9. What is the main cause of failure of helper T cells in Job's syndrome?
A) Failure to produce IgG
B) Mutation in the gene encoding integrin
C) Gamma interferon deficiency
D) Deficient neutrophil chemotaxis