Which radioactive element is used in the treatment of cancer?

Q. Which radioactive element is used in the treatment of cancer?
A. Iodine-131
B. Uranium-234
C. Plutonium-239
D. Cobalt-60
Answer: Cobalt-60

A. Iodine-131
B. Uranium-234
C. Plutonium-239
D. Cobalt-60
Answer: Cobalt-60