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

C. SCALLOP

Choose or find odd number pair - (83 - 75), (58 - 50), (49 - 42), (25 - 17)

C. 49 - 42

Choose or find odd word - Mahavir , Buddha , Marx , Jesus , Gandhi

C. MARX

Choose or find odd word - Sial , Mantle , Core , Sima , Pengia

A. PENGIA

Choose or find odd number - 7851 , 6432 , 5789 , 1325 , 8167

B. 6432