Question

Study of lizards is.
A. Herpetology
B. Saurology
C. Nidology
D. Ichthyology

Answer 1

Hint: Lizards are part of the family reptilia in the phylum Chordata. Many lizards can change their body color with respect to the environment. Try to remember the scientific terms for lizards. This comes under the study of reptiles. But there is a specific term only applicable to lizards.

Complete answer:
Let’s write down the characteristics of studies given in other options.
Herpetology – It is a large branch of zoology that deals with families' amphibia and reptilia in phylum Chordata. Birds, which are usually grouped with reptiles, are excluded here. Their study is called ornithology. So herpetology can be more precisely stated as the study of cold-blooded animals with four limbs (tetrapod). Technically Saurology can be considered as a small branch of herpetology.
Nidology – It is the study of bird nests. Different birds have very different nest types. The type of the nest will depend on the habitat and enemies, egg-laying season, and resources available from the surroundings. This is a small branch under ornithology and a part of oology.
Ichthyology – It is the branch of biology which deals with the study of fishes. Fishes here are defined as animals from the families Osteichthyes (bony fishes), Chondrichthyes (Cartilaginous fishes), and Agnatha (jawless fishes).
All of these studies come under the branch of vertebrate zoology.

The study of lizards is called Saurology. Saurology is very specifically applicable to lizards only and no other members of the same family such as snakes or turtles.

Note:
One major confusion can arise from the option herpetology. Herpetology includes the study of lizards as well. But it also includes other groups of reptiles. So, it is to be understood that the more precise answer is Saurology, which is exclusively the study of lizards. A short cut to this question and this question only is remembering, dinosaurs were large lizards.