Choose or find odd word - Grass , Amaranthus , Oats , Chenopodium , Convolvulus

C. OATS

Choose or find odd word - Ruby , Sapphire , Granite , Topaz

C. GRANITE

Choose or find odd pair of words - (Steel : Utensils) , (Bronze : Statue) , (Duralumin : Aircraft) , (Iron : Rails)

D. IRON : RAILS

Choose or find odd word - Indigo , Orange , Yellow , Pink , Green

D. PINK

Choose or find odd number pair - (18 - 45) , (16 - 40) , (14 - 28) , (8 - 20)

C. 14 - 28