Direction for: In each of the following questions a statement of Assertion is given followed by a corresponding statement of Reason just below it. Of the statements mark the correct answer as
Assertion: Cobalt-60 is useful in cancer therapy. Reason: Cobalt-60 is source of y-radiations capable of killing cancerous cell.A) If both assertion and reason are true and the reason is the correct explanation of assertion.
B) If both assertion and reason are true but the reason is not the correct explanation of the assertion.
C) If assertion is true statement but reason is false.
D) If both assertion and reason are false.
Correct Answer: A
Solution :
Radiotherapy is exposing tumours/cancer cells to radiations, as from radioactive cobalt-60, Radon-120, I-131. Cobalt-60 is a source of y-radiations. These radiations kill cancer cells 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.
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