Identify the mismatched pair regarding the characteristics of cancer.

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:

Cancer is related to

Explain the types of cancerous tumors.

Which one of the following statements is correct?

Which of the following are ionizing radiations?
$(i)$ $X$-rays $(ii)$ $UV$-rays $(iii)$ $\gamma$-rays $(iv)$ $IR$-rays