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

C. STAR : GALAXY

Choose or find odd word - Parrot , Swan , Vulture , Sparrow , Koel

B. SWAN

Choose or find odd letter group - BCDEI , PQRSW , LMNOS , TUVWA , HIKLO

E. HIKLO

Choose or find odd word - Madagascar , Thailand , Cude , Greenland , Tasmania

B. THAILAND

Choose or find odd letter group - DE , PQ , TU , MO , FG

D. MO