This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Medicine
[{'content': "A 45-year-old female presents with symptoms of thyrotoxicosis. The RAIU scan shows increased uptake. Which of the following is the most likely diagnosis? \nSelect and explain. \nA. Hashimoto's thyroiditis, B. Struma ovarii, C. Thyrotoxicosis factitia, D. Choriocarcinoma", 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. D. ChoriocarcinomaChoriocarcinoma produces beta hCG which acts on TSH receptor to stimulate uptake of Iodine.Hence RAIU would show increased uptake.Option A.Hashimoto's thyroiditisAny inflammation of thyroid will lead to reduced Uptake of Iodine.Option B & C.Struma ovari and thyrotoxicosis factitia lead to reduced TSH leading to reduced uptake of iodine.", 'role': 'assistant'}]