A mosquito is a type of fly.

Mosquitoes belong to the order Diptera, which is characterized by having two wings, making them a type of fly. This classification is essential in entomology, where insects are grouped based on their morphological and behavioral characteristics. Mosquitoes not only share this wing structure with true flies, but they also undergo similar life cycle stages, including egg, larva, pupa, and adult. Thus, recognizing that a mosquito is a type of fly aligns with the scientific classification of insects. The other choice does not accurately reflect the biological categorization of mosquitoes within the fly group.