Choose or find odd number - 11 , 13 , 15 , 17

C. 15

Choose or find odd number pair - (21 - 49) , (24 - 64) , (25 - 54) , (81 - 36)

C. 25 - 54

Choose or find odd pair of words - (Malaria : Protozoa) , (Yeast : Fungi) , (Typhoid : Bacteria) , (Polio : Virus)

B. YEAST : FUNGI

Choose or find odd letter group - RNJ , XTP , MIE , ZWR

D. ZWR

Choose or find odd letter group - NPM , IJL , QSZ , BHK , XGT

B. IJL