This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Communicable Diseases, Subject name: Social & Preventive Medicine
Arthropod with four pairs of legs 
Select and explain. 
A. Insecta, B. Crustsea, C. Arachnida, D. None
C: Arachnida
Answer: C: Arachnida 
Explanation: Ans. c (Arachnida) (Ref. Text book of PSM by Park 22nd/ 716) InsectaArachnidaCrustaceaBody divisionsHead,Cephalothorax, ThoraxCephalothorax AbdomenAbdomenAbdomenLegs3 pairs4 pairs5 pairsAntennae1 pairNo2 pairsWings1 or 2 pairs, some winglessNoneNoneWhere foundOn landOn landIn watere.g.Mosquitoes: Anopheles, Culex, AedesFlies:Houseflies, Sandflies,Tsetse flies,Blackflies. Reduvid bugs.Human lice: Head & body lousePubic/crab louseFleas:Rat fleas, SandfleasHard tick; Soft tickMites: leptotrombidium & trombiculid mite, itch miteCyclops