In the following question, select the odd word pair from the given alternatives.

Explanation

The logic followed here is: the first word represents the field of study, and the second word represents the field. 1) Physiology - Body → Physiology is the study of the functions of the body. 2) Pedology - Fishes → Pedology is the study of soils, not fishes ⇒ doesn't follow the logic. 3) Entomology - Insects → Entomology is the study of insects. 4) Selenography - Moon → Selenography is the study of the surface and physical features of the moon. Here, we can see that only Option 2 doesn't follow the logic. Hence, the correct answer is "Pedology - Fishes".