What Is Unusual About People Who Are Naturally Resistant to HIV

Multiple Choice

What is unusual about people who are naturally resistant to HIV infection?

A) They are all homozygous for a mutant allele of the CC-CKR5 gene.
B) They are all homozygous for a mutant allele of the HLA complex gene.
C) They are all homozygous for a mutant allele of the Rh gene.
D) They do not have any T4 helper cells.
E) They are all heterozygous for a mutant allele of the CC-CKR5 gene.