Oncology is the branch of medicine that deals with the study, diagnosis, and treatment of cancer. Doctors who specialize in treating cancer are called oncologists.

Cancer is a disease where cells in the body grow uncontrollably. Oncology covers many things, like:
- Finding out if someone has cancer (diagnosis)
- Deciding on the right treatment (like surgery, radiation, or chemotherapy)
- Helping patients recover and stay healthy

Let’s look at the other terms:
- Zoology is the study of animals.
- Ecology is the study of how living things interact with each other and their environment.
- Genomic is the study of genes and DNA, which can be part of cancer research, but it is not the main name for cancer study.

So, the correct answer is Oncology.