Four of the Following are Chelicerates

Question

Four of the following are chelicerates.Which one is the exception?  
A) Tick
B) Mosquito
C) Spider
D) Horseshoe crab
E) Scorpion

Accepted Answer

Mosquitoes belong to the order Diptera, which includes all true flies. They have only one pair of wings, while chelicerates have no wings or two pairs of wings.