You are answering a USMLE-style medical question. Question: A 25-year-old Hispanic male presents with heat intolerance and recent weight loss. Serum analysis shows increased levels of T4 and T3, as well as the presence of thyroglobulin-stimulating immunoglobulins. The patient is found to be tachycardic and has marked edema and waxy discoloration in his legs. Which of the following would be consistent with this patient's disease? Options: A) Sympathetic underactivity B) Anti-thyroglobin antibodies C) Exophthalmos D) Increased TSH release Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.