Choose or find odd pair of words - (Oil : Lamp) , (Water : Tap) , (Oxygen : Life) , (Power : Machine)

B. WATER : TAP

Choose or find odd word - Oyster , Whelk , Scallop , Mussel , Clam

C. SCALLOP

Choose or find odd word - Asia , Argentina , Africa , Australia , Antarctia

B. ARGENTINA

Choose or find odd letter group - PRVX , MQTV , DHKM , BFIK

A. PRVX

Choose or find odd word - Buffalo , Llama , Cow , Goat , Camel

B. LLAMA