Context: In a group of rainbow trout, some individuals have a greenish-brown body and others have a blue body. In this group, the gene for the body color trait has two alleles. The allele B is for a greenish-brown body, and the allele b is for a blue body.
A certain rainbow trout from this group has a blue body. This trout has two alleles for a blue body.
Based on this information, what is this rainbow trout's genotype for the body color gene?
A. bb
B. a blue body
Select the correct answer from the provided options and reply with the letter associated with it.

A