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

C. ENGINE : TRAIN

Choose or find odd pair of words - (Cow : Calf), (Dog : Bitch), (Lion : Cub), (Tortoise : Turtle), (Insect : Larva)

B. DOG : BITCH

Choose or find odd pair of words - (Mercury : Sun) , (Moon : Earth) , (Star : Galaxy) , (Wheel : Axle)

C. STAR : GALAXY

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

A. CURD : MILK

Choose or find odd pair of words - (Blacksmith : Anvil), (Carpenter : Saw), (Barber : Scissor), (Goldsmith : Ornaments), (Sculptor : Chisel)

D. GOLDSMITH : ORNAMENTS