Cabalt-60 is useful in cancer therapy.
Cabalt-60 is source of `Y-radiations` capable of killing cancerous cell/

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion.
B. If both assertion and reason are true but reason is not the correct explanation of assertion.
C. If assertion is true but reason is false
D. If assertion is false but reason is true.

Answer

A

Explanation

(a) Radiotherapy is exposing tumours//cancer cells to radiations, as from radioactive cobalt `-60`. Radon `-120`, `I -131`. Carbalt `-60` is a source of `gamma-raioactions`. These because cancer cells are more rapidly than others because cancer cells are undifferentiated. However, healthy cells in vicinity of cancer cells are also damaged.
Hence, option (a) is true.