The inherent property of a tumor that determines how the tumor responds to radiation is called radiosensitivity. When radiation is combined with cytotoxic drugs, it has been noted that there is a radiosensitizing effect on tumor cells. Which drug is considered a radiosensitizer?

That enhances the sensitivity of cancerous tumor cells toward the applied radiation dose.

Explanation:

It is a known fact that tumor cells are very hard to treat so, to increase their sensitivity toward radiation, the body of the patient is treated with special kind of cytotoxic drugs that enhance the sensitivity or exposure of those cancerous cells toward radiation and made them vulnerable. These drugs are applied to modern approaches because of their extensive action toward tumor cells.