This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology and breast, Subject name: Surgery
In which of the following conditions Radioactive iodine can be used in grave&;s disease 
Select and explain. 
A. Recurrence, B. Age < 40 years, C. Eiderly, D. Pregnant
B: Age < 40 years
Answer: B: Age < 40 years 
Explanation: Disaadvantages of radio active iodine include exacerbation of cardiac arrhythmias, paicularly in older patients, possible fetal damage in pregnant women, worsening ophthalmic problems, and rare but possibly life-threatening thyroid storm Patients who have Graves disease refractory to RAI also should be considered for thyroidectomy Source: Sabiston 20th edition Pg : 892