text: A CT scan is useful in distinguishing extraocular muscle enlargement from fat expansion which is common in Graves'<unk> .
option_0: Graves' disease CT
option_1: Graves' disease x ray
option_2: Hashimoto's thyroiditis CT
option_3: Autoimmune polyendocrine syndrome CT
option_4: Riedel's thyroiditis CT scan
option_5: Riedel's thyroiditis x ray
option_6: Riedel's thyroiditis MRI
option_7: Graves' disease physical examination