Choose or find odd number - 21 , 39 , 51 , 63 , 83

E. 83

Choose or find odd pair of words - (Sahara : Africa) , (Thar : India) , (Kalahari : America) , (Gobi : Mongolia)

C. KALAHARI : AMERICA

Choose or find odd pair of words - (Flower : Petal) , (Chair : Leg) , (Circle : Arc) , (Cover : Page)

D. COVER : PAGE

Choose or find odd number - 5698 , 4321 , 7963 , 4232 , 8597

D. 4232

Choose or find odd word - Cotton , Jute , Silk , Nylon , Wool

D. NYLON