Context: In a group of rock pocket mice, some individuals have dark fur and others have light fur. In this group, the gene for the fur color trait has two alleles. The allele F is for dark fur, and the allele f is for light fur.
Nutmeg, a rock pocket mouse from this group, has dark fur. Nutmeg has two alleles for dark fur.
Based on this information, what is Nutmeg's phenotype for the fur color trait?
A. dark fur
B. FF
Determine the correct option from the provided choices and reply with its corresponding letter.
Answer: A