You are answering a USMLE-style medical question. Question: A 25-year-old woman comes to the office complaining of pelvic pain and feeling “off” for the past few weeks. She has not had any changes in diet or lifestyle but reports weight loss despite an increase in appetite. In addition, she has been experiencing chest palpitations, increased frequency of diarrhea, and heat intolerance. Physical exam of her thyroid is unremarkable but her TSH was found to be 0.21 mIU/L. A complex structure in her right ovary was detected on ultrasound. Her symptoms can be explained by which of the following? Options: A) Meigs syndrome B) Jod-Basedow phenomenon C) Dermoid cyst D) Struma ovarii Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.