Which one of the following is used in the treatment of blood cancer?

Correct answer: (e) None of the above/More than one of the above

Explanation

Radioactive phosphorus-32 is used to treat some blood cancers (leukaemia), and cobalt-60 is used in radiotherapy of cancers.

Iodine-131 is used for thyroid disease. Since more than one option applies, the answer is "More than one of the above".