A 26-year-old female presents with exophthalmos, goiter, heart rate 100 bpm, increased thyroid <sup>131</sup>I uptake, and T<sub>3</sub> suppression test showing <50% suppression. The most likely diagnosis is:
A 26-year-old female presents with exophthalmos, goiter, heart rate 100 bpm, increased thyroid <sup>131</sup>I uptake, and T<sub>3</sub> suppression test showing <50% suppression. The most likely diagnosis is: