Context: This passage describes the wing type trait in fruit flies:

In a group of fruit flies, some individuals have normal wings and others have vestigial wings. In this group, the gene for the wing type trait has two alleles. The allele for vestigial wings (n) is recessive to the allele for normal wings (N).
A certain fruit fly from this group has the heterozygous genotype Nn for the wing type gene.
Based on this information, what is this fly's phenotype for the wing type trait?
A. normal wings
B. vestigial wings
Select the correct answer from the provided options and reply with the letter associated with it.
Answer: A