Context: This passage describes the Thomsen disease trait in humans:

In a group of humans, some individuals have Thomsen disease and others do not. In this group, the gene for the Thomsen disease trait has two alleles. The allele for having Thomsen disease (M) is dominant over the allele for not having Thomsen disease (m).
Elijah is a human from this group. Elijah has the homozygous genotype mm for the Thomsen disease gene.
Based on this information, what is Elijah's phenotype for the Thomsen disease trait?
A. having Thomsen disease
B. not having Thomsen disease
Select the correct answer from the given choices and respond with the letter of the chosen option.
Answer: B