Context: This passage describes the Huntington's disease trait in humans:

In a group of humans, some individuals have Huntington's disease and others do not. In this group, the gene for the Huntington's disease trait has two alleles. The allele for having Huntington's disease (H) is dominant over the allele for not having Huntington's disease (h).
Erin is a human from this group. Erin has the homozygous genotype HH for the Huntington's disease gene.
Based on this information, what is Erin's phenotype for the Huntington's disease trait?
A. not having Huntington's disease
B. having Huntington's disease
From the given choices, select the correct answer and reply with the letter of the chosen option.

B