A 9-year-old cat presents with progressive weight loss, polyphagia, and a palpable ventral neck mass. T4 is markedly elevated. After confirming hyperthyroidism, which treatment option provides the best chance of permanent cure?
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A
Oral methimazole for life
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B
Radioactive iodine (I-131) therapy
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C
Bilateral thyroidectomy
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D
Dietary iodine restriction alone