A 70-year-old woman with known ischaemic heart disease and new primary hypothyroidism has a TSH of 22 mU/L and low free T4. She is otherwise well. What is the most appropriate initial Levothyroxine regimen?AStart Levothyroxine 25 micrograms once daily and titrate slowlyBStart Levothyroxine 75 micrograms once daily immediatelyCStart Levothyroxine 150 micrograms once dailyDWithhold Levothyroxine and repeat thyroid function in 6 monthsEStart Liothyronine aloneCheck my answer