The type of tumor that spreads from one part of the body to another is called .....

$X$-rays damage $DNA$ and convert it into.........

Which of the following is an example of an anticancer drug?

What is an oncogenic virus?

Retroviruses are involved in cancer in humans because they ...............

Which of the following statements are correct?
$A.$ Computed tomography and magnetic resonance imaging detect cancers of internal organs.
$B.$ Chemotherapeutic drugs are used to kill non-cancerous cells.
$C.$ $\alpha$-interferon activates 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: