Context: In a group of dogs, some individuals have short fur and others have long fur. In this group, the gene for the fur length trait has two alleles. The allele F is for short fur, and the allele f is for long fur.
Otto, a dog from this group, has short fur. Otto has two alleles for short fur.
Based on this information, what is Otto's phenotype for the fur length trait?
A. short fur
B. FF
Determine the correct option from the provided choices and reply with its corresponding letter.

A