This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
[{'content': 'A 23 year old asymptomatic woman attends her family physician for thyroid function testing as her mother has recently been commenced on levothyroxine. Thyroid functiontests (TFTs) show TSH 6miU/L, and free\nT4 of 12.4 pmoi/L (0.96 ng/dL). Her serum thyroid peroxidase antibodies are strongly positive. What is the most appropriate management plan? \nSelect and explain. \nA. Check thyroglobulin antibodies, B. Arrange a scintigraphy scan, C. Reassure and discharge, D. Repeat TFT s in 4-6 months', 'role': 'user'}, {'content': 'Answer: B \nExplanation: This woman has subclinical hypothyroidism. There is no benefit in checking thyroglobulin antibodies as it does not change her diagnosis or management. With positive thyroid peroxidase antibodies she has a higher risk of progression to overt thyroid failure. A trial of thyroxine replacement would be advocated if her TSH was > 1 0 miU/L or she developed symptoms suggestive of progression to clinical disease. Reviewing her biochemistry and symptomatology is therefore necessary.', 'role': 'assistant'}]