Choose or find odd number - 15 , 21 , 24 , 28 , 30

D. 28

Choose or find odd pair of words - (Shopkeeper : Customer) , (Doctor : Patient) , (Lawyer : Client) , (Clerk : File)

D. CLERK : FILE

Choose or find odd word - Fox , Wolf , Jackal , Deer , Panther

D. DEER

Choose or find odd pair of words - (Mason : Wall) , (Cobbler : Shoe) , (Farmer : Crop) , (Chef : Cook) , (Choreographer : Ballet)

D. CHEF : COOK

Choose or find odd pair of words - (Iran : Asia) , (Canberra : Australia) , (Norway : Europe) , (Algeria : Africa)

B. CANBERRA : AUSTRALIA