<prompt> Radioiodine is used in treatment of ?Graves diseaseHypothyroidismMedullary carcinomaAnaplastic carcinoma  <response>: Ans. is a i.e., Graves diseaseRef: KDT p.255Radioactive iodine is administered as sodium salt of r3rl dissolved in water and taken orally.The most common indication is hypehyroidism due to Gravesdisease or toxic nodular goiter. The average therapeutic dose is 3-6 m curie-calculated on the basis of previous tracer studies and thyroid size. 