<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 35-year-old woman presents to the clinic for a several-month history of heat intolerance. She lives in a small apartment with her husband and reports that she always feels hot and sweaty, even when their air conditioning is on high. On further questioning, shes also had a 4.5 kg 10 lb unintentional weight loss. The vital signs include: heart rate 102min and blood pressure 15080 mm Hg. The physical exam is notable for warm and slightly moist skin. She also exhibits a fine tremor in her hands when her arms are outstretched. Which of the following laboratory values is most likely low in this patient?? A: Calcitonin, B: Glucose, C: Triiodothyronine T3, D: Thyroxine T4, E: Thyroid-stimulating hormone,  <response>: Based on the patients symptoms of heat intolerance, unintentional weight loss, elevated heart rate and blood pressure, warm and moist skin, and fine tremor, this patient likely has hyperthyroidism. The lab values that would be expected to be low in a patient with hyperthyroidism are TSH and T4. TSH levels are low because the high levels of T3 and T4 that occur in hyperthyroidism provide negative feedback to the pituitary to decrease TSH production. T4 levels are low because the increased metabolism of thyroid hormone in hyperthyroidism leads to increased conversion of T4 to T3.T3 levels would be expected to be elevated in hyperthyroidism due to increased production and conversion from T4. Glucose may be slightly elevated due to increased metabolism. Calcitonin levels are unrelated to thyroid function.Based on this analysis, the lab value most likely to be low in this patient with suspected hyperthyroidism is TSH.E: Thyroid-stimulating hormone 