Choose or find odd word - Nail , Feather , Trunk , Fir , Tail

D. FIR

Choose or find odd word - Thyroxine , Adrenalin , Iodine , Insulin

C. IODINE

Choose or find odd pair of words - (Stallion : Colt) , (Horse : More) , (Dog : Bitch) , (Drake : Duck) , (Drone : Bee)

A. STALLION : COLT

Choose or find odd pair of words - (Sprinkle : Pour), (Happiness : Merriment), (Mist : Fog), (Sad : Unhappy)

D. SAD : UNHAPPY

Choose or find odd word - Arhar , Urad , Moong , Gram , Jowar

E. JOWER