A 42-year-old woman presents with fatigue, weight gain and constipation. Examination shows dry skin and periorbital puffiness. TSH is 19 mIU/L (normal 0.4-4.5) and free T4 is low. Which is the most appropriate initial management?AStart levothyroxine at a full replacement dose and recheck TSH in 6-8 weeksBStart liothyronine (T3) monotherapyCReassure and repeat thyroid function tests in one yearDStart empiric iodine supplementationEOrder thyroid ultrasound before starting any treatmentCheck my answer