What is the significance of the gene mutation in the battle against human immunodeficiency virus (HIV)?
A. The CCR5 gene mutation has reduced the scope of gene therapy as a treatment procedure.
B. People with two copies of the CCR5 gene mutation, when infected, show much slower disease progression.
C. The CCR5 gene mutation is much more common in Asia than in other parts of the world.
D. People with two copies of the CCR5 gene mutation are resistant to infection.
Answer: D
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