A 34-year-old woman with a history of Graves disease（毒性弥漫性甲状腺肿） and one week of illness is admitted to the ICU with altered mental status. She is vomiting, tremulous（震颤）, and diaphoretic（发汗）. She has a temperature of 40°C (104°F), heart rate 140 beats/min, blood pressure 90/45 mmHg, and respiratory rate 28 breaths/min.
Which of the following sequences of medication administration is the most appropriate initial treatment?
A. Propylthiouracil (PTU)（丙硫氧嘧啶）, propranolol（普萘洛尔）, cholestyramine（消胆胺）, iodine（碘）
B. Cholestyramine, iodine, PTU, propranolol
C. Propranolol, iodine, PTU, cholestyramine
D. Iodine, PTU, dexamethasone, propranolol
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