Choose or find odd number pair - (81 - 63) , (24 - 48) , (21 - 15) , (13 - 39)

A. 81 - 63

Choose or find odd number pair - (3 - 4) , (16 - 26) , (26 - 24) , (27 - 22)

B. 16 - 26

Choose or find odd letter group - PQO , AtB , SIM , mnZ , DfE

D. MNZ

Choose or find odd word - Coarse , Unrefined , Vulgar , Oafish , Blunt

E. BLUNT

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

A. STALLION : COLT