Choose or find odd pair of words - (Pistol : Gun) , (Knife : Dagger) , (Engine : Train) , (Car : Bus)

C. ENGINE : TRAIN

Choose or find odd number - 27 , 125 , 343 , 729 , 1321

E. 1321

Choose or find odd letter group - WRONG , PRUNE , WHITE , RIGHT

D. RIGHT

Choose or find odd pair of words - (Atom : Electron) , (Train : Engine) , (House : Room) , (Scooter : Gears) , (Curd : Milk)

A. CURD : MILK

Choose or find odd word - Kennel , House , Stable , Aviary , Aquarium

B. HOUSE