1. What is the cause of paroxysmal nocturnal hemoglobinuria?
A) Deficiency of molecules that attach decay-accelerating factor (DAF)
B) Complement-mediated hemolysis during sleep
C) Increased activation of complement
D) Decreased concentration of oxygen in the blood

2. Which component of the complement is deficient in hereditary  angioedema?
A) C1 inhibitor
B) C3a
C) C4a
D) C5a

3. What is the key deficiency in chronic granulomatous disease?
A) Decay-accelerating factor (DAF)
B) Complement proteins
C) Red blood cell membrane proteins
D) NADPH oxidase