A 68-year-old woman with long-standing hypothyroidism feels increasingly tired. Her TSH is 12 mU/L (high) and free T4 is low. She is taking Levothyroxine 75 micrograms once daily and is otherwise well. What is the most appropriate management?AIncrease Levothyroxine dose by 25 micrograms dailyBStop Levothyroxine immediatelyCSwitch to Liothyronine monotherapyDContinue current dose and recheck TFTs in 12 monthsEStart high-dose steroids for suspected thyroiditisCheck my answer