Direction.
Of the given four pairs three pairs express the relationship similar to that expressed in the capitalised pair. Select that pair which is not related in this way.
Propeller : Dog
Radar : Satellite
Hydrogen : Balloon
Accelerator : Car
A. Propeller : Dog
Medicine: Germs
Calcium: Bones
Knife: Laceration
Fire: Explosion
Vacation : Work
Retirement : Retreat
Sabbatical : Freedom
Intermission : Respite
Dour : Humous
Nod : Assnet
Virus : Influenza
Feet : Walk
Irreducible : Reduce
Cemetery : Death
Hydro: Water
Pliable: Bend
Chef : Banquet
Legislator : Election
Moderator : Debate
Prodigy : Wonder
Carpenter : Saw
Painter : Brush
Poet : Sonnet
Sculptor : Atelier
Shovel : Instrument
Book : Anthology
Rim : Edge
Training : Preparation
Understudy : Actor
Audio : Video
Baedeker : Tourist
Mentor : Guidance
Shoes : Feet
Leash: Dog
Tail: Kite
Ring: Finger
Ewe is for Ram
Ram is for Ewe
Goose is for Gander
Sow is for Boar
Woods : Tree
School : Fish
Reptile : Snake
Tusk : Elephant
Elbow : Wrist
Teeth : Mouth
Arm : Leg
Fist : Hand
Memory : Commemoration
Display : Exhibition
Admission : Initiation
Solemn : Vestment
Overt : Furtive
Covert : Stealthy
Open : Close
News : Rumour
Absorbent : liquid
Desert : sand
Autoclave : germ-free
Hermetic : air
Conjuror
Hypnotist
Comedian
Buskar
Helmet : motorcycle
Boot : saddle
Switch : light
Pad : helicopter
Tireless : Tired
Tired : Habitual
Tireless : Habitual
Impoverished : Habitual
Musician : Instrument
Carpenter : Cabinet
Sculptor : Chisel
Baker : Oven
Emotion : Invulnerable
Defect : Intolerable
Flaw: Impeccable
Cure : Irreversible
Glide : drift
Drizzle : downpour
Gambol : play
Stagnate : flow
Skeleton : Flesh
Method : System
Plant : Genus
Dinosaur : Tyrannosaurus
Happiness : Joy
Amity : Harmony
Enemy : Hatred
Sorrow : Misery
Technique : Inept
Physique : Sturdy
Fabric : Silk
Intellect : Noble
Fabric : tapestry
Portrait : paint
Document : author
Coverlet : cloth
Laugh : Cry
Happiness: Birth
Fear: Hate
Confusion: Anger
Prodigal: Philanthropist
Petulant: Complainer
Quizzical : Critic
Compulsive : Liar
Laughter : Barn
Equine : Horse
Impulsive : Considered
Fundamental : Elemental
Prologue : novel
Movement : sympathy
Sketch : drawing
Index : book
Akbar : British
Present : Future
Shakespeare : Tennyson
Colossus : Elephant