<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 54-year-old woman is brought to the emergency department by a nurse 30 minutes after receiving scheduled radiation therapy for papillary thyroid cancer. After the radioisotope was ingested, the physician realized that a much larger fixed dose was given instead of the appropriate dose based on radiation dosimetry. Which of the following pharmacotherapies should be administered immediately to prevent complications from this exposure?? A: Propylthiouracil, B: Mercaptoethanesulfonate, C: Potassium iodide, D: Methimazole, E: Dexrazoxane,  <response>: This is a question about managing radiation exposure in a patient who accidentally received an excessive dose of radioisotope therapy for thyroid cancer. The goal is to prevent complications from the radiation exposure. Propylthiouracil, methimazole, and dexrazoxane are medications used for other purposes - propylthiouracil and methimazole treat hyperthyroidism, while dexrazoxane is used as a cardioprotectant in some chemotherapy regimens. They would not be helpful in this scenario.The two relevant choices are potassium iodide and mercaptoethanesulfonate MESNA. Both of these drugs can help block thyroid uptake of radioactive iodine, limiting further radiation exposure. Potassium iodide is more commonly used and recommended for this purpose. MESNA also binds and blocks iodine uptake, but is not typically used for radiation exposure.Based on this analysis, potassium iodide would be the best answer. It is the standard recommended treatment to block thyroid uptake of radioactive iodine in cases of excessive exposure.C: Potassium iodide 