Which of the statement regarding treatment of cancer is false?
I. Chemotherapy has side effects like hair loss and anaemia.
II. Radon (Rn-220) is the most commonly used isotope for radiation therapy.
III. `alpha`- interferon are used as immunological substances which activate the immune system.
IV. Isotope of carbon is also for radiation therapy.
A. I and II
B. Only III
C. Only IV
D. II and IV
