Which is true of the biphasic hemolysin usually associated with paroxysmal cold hemoglobinuria (PCH)?
a. Anti-P that binds to red blood cells at body temperature but activates complement at cool temperatures
b. Anti-P that binds to red blood cells at cool temperatures but activates complement at body temperature
c. Anti-P1 that binds to red blood cells at body temperature but activates complement at cool temperatures
d. Anti-P1 that binds to red blood cells at cool temperatures but activates complement at body temperature
Answer: b
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