A 37-year-old woman has TSH 12 mIU/L and free T4 below the reference range, with fatigue and weight gain. She is otherwise healthy and not pregnant. Which initial levothyroxine regimen is most appropriate?AStart 25 µg once daily and recheck in 12 monthsBStart 50 µg once daily for all adults irrespective of weightCStart approximately 1.6 µg/kg/day levothyroxine once dailyDWithhold levothyroxine; repeat TSH in 6 monthsEStart liothyronine (T3) aloneCheck my answer