Explanation:

- Virology

- The correct answer is Option 2.

- Virology is the study of viruses and viral diseases.

- It examines virus structure, genetics, and interactions with hosts.

- Parasitology

- This is the study of parasites and their interactions with host organisms.

- It covers a wide range of organisms like protozoa, helminths, and arthropods.

- Protozoology

- This focuses on the study of protozoa, the single-celled eukaryotic organisms.

- Often these are studied within parasitology due to their parasitic nature.

- Mycology

- This is the study of fungi.

- It includes yeasts, molds, and mushrooms.