A 40-year-old woman presents with fatigue, weight gain, cold intolerance, and constipation. TSH is 12 mIU/L with a low free T4. What is the most appropriate treatment?
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A
Liothyronine (T3) supplementation only
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B
Levothyroxine (T4) replacement
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C
Radioactive iodine ablation
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D
Thyroidectomy