Which describes warm vs cold autoimmune hemolytic anemia?

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Which describes warm vs cold autoimmune hemolytic anemia?

• A.both occur at the same temperature
• B.warm = IgM; cold = IgG
• C.warm = IgG (often extravascular); cold = IgM (often intravascular, associated with Mycoplasma, EBV)
• D.both are IgE