With regard to SLE:
A. 10–15% of Caucasian SLE patients are homozygous for C4A deficiency.
B. 90% of C1q deficient patients ,present with lupus.
C. Antibodies to C1q occur in 15–20% of SLE.
D. In patients with SLE, the prevalence of selective IgA deficiency ranges from 1% to 5%.
E. Klinefelter’s syndrome associated with SLE.
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