Context: This passage describes the albinism trait in rats:

In a group of rats, some individuals have albinism and others do not. In this group, the gene for the albinism trait has two alleles. The allele for having albinism (a) is recessive to the allele for not having albinism (A).
Squeaky is a rat from this group. Squeaky has the heterozygous genotype Aa for the albinism gene.
Based on this information, what is Squeaky's phenotype for the albinism trait?
A. having albinism
B. not having albinism
Identify the correct option from the choices provided and respond with the letter of the correct option.

B