Context: In a group of cows, some individuals have solid coloring and others have white spots. In this group, the gene for the coat pattern trait has two alleles. The allele A is for solid coloring, and the allele a is for white spots.
Sage, a cow from this group, has white spots. Sage has two alleles for white spots.
Based on this information, what is Sage's phenotype for the coat pattern trait?
A. white spots
B. aa
Answer with the option's letter from the given choices directly.

A