This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
Radioiodine is used in treatment of ? 
Select and explain. 
A. Graves disease, B. Hypothyroidism, C. Medullary carcinoma, D. Anaplastic carcinoma
A: Graves disease
Answer: A: Graves disease 
Explanation: Ans. is 'a' i.e., Graves disease(Ref: KDT p.255)Radioactive iodine is administered as sodium salt of r3rl dissolved in water and taken orally.The most common indication is hypehyroidism due to Graves'disease or toxic nodular goiter. The average therapeutic dose is 3-6 m curie-calculated on the basis of previous tracer studies and thyroid size.