Which are correct:

A.   Computed tomography and magnetic resonance imaging detect cancers of internal organs.

B.   Chemotherapeutics drugs are used to kill non-cancerous cells.

C.   α -interferon activate the cancer patients’ immune system and helps in destroying the tumour.

D.   Chemotherapeutic drugs are biological response modifiers.

E.   In the case of leukaemia blood cell counts are decreased.

Choose the correct answer from the options given below:

**Statement A:** “Computed tomography (CT) and magnetic resonance imaging (MRI) detect cancers of internal organs.” – This is correct. Both CT and MRI are imaging techniques that can visualize internal structures and reveal abnormal masses or lesions indicative of cancer.

**Statement B:** “Chemotherapeutic drugs are used to kill non‑cancerous cells.” – This is incorrect. Chemotherapy is designed to target rapidly dividing cancer cells; although it may also affect some normal rapidly dividing cells (causing side effects), its primary purpose is not to kill non‑cancerous cells.

**Statement C:** “α‑interferon activates the cancer patients’ immune system and helps in destroying the tumour.” – This is correct. Alpha‑interferon is an immunomodulatory agent that stimulates immune responses, enhancing the ability of the body to attack tumor cells.

**Statement D:** “Chemotherapeutic drugs are biological response modifiers.” – This is incorrect. Biological response modifiers (BRMs) are agents such as cytokines, monoclonal antibodies, or vaccines that modify the immune response. Conventional chemotherapeutic drugs are cytotoxic chemicals, not BRMs.

**Statement E:** “In the case of leukaemia blood cell counts are decreased.” – This is incorrect. Leukemia is characterized by an overproduction of abnormal white blood cells, so the overall blood cell count is usually elevated, not decreased (though anemia may occur later).

Combining the accurate statements, the correct option is **A and C only**.