Verbal - Odd Man Out

DIRECTIONS : In this oddman out section we need choose the word or pair that different from remaining words or pairs.
46. Pick the odd one out
  A.  Astrology
  B.  Mycology
  C.  Nephrology
  D.  Pathology
47. Pick the odd one out
  A. Small pox
  B. Cholera
  C. Typhoid
  D. Tuberculosis

48. Pick the odd one out
  A.  Jumping
  B.  Jogging
  C.  Exercising
  D.  Running
49. Pick the odd one out
  A.  Snake
  B.  Frog
  C.  Tortoise
  D.  Mongoose
50. Pick the odd one out
  A.  Lion
  B.  Zebra
  C.  Tiger
  D.  Crocodile