Verbal - Odd Man Out

DIRECTIONS : In this oddman out section we need choose the word or pair that different from remaining words or pairs.
91. Pick the odd one out
  A.  Iron
  B.  Nickel
  C.  Cobalt
  D.  Aluminium
92. Pick the odd one out
  A. Lake
  B. River
  C. Sea
  D. Pool

93. Pick the odd one out
  A.  Goat
  B.   Centaur
  C.  Lion
  D.  Tortoise
94. Pick the odd one out
  A.  Triangle
  B.  Square
  C.  Circle
  D.  Rectangle
95. Pick the odd one out
  A.  Parrot
  B.   Swan
  C.  Sparrow
  D.  Vulture