A 35-year-old woman presents with tiredness and weight gain. TSH is 12 mIU/L (reference 0.4-4.0) and free T4 is low. She is not pregnant. According to Australian thyroid management practice, what is the most appropriate initial treatment?AStart carbimazole and monitor thyroid functionBStart levothyroxine and titrate to normalise TSHCStart radioactive iodine therapyDObserve without treatment and repeat TFTs in 12 monthsEOrder thyroid ultrasound and no treatment yetCheck my answer