<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 55-year-old man comes to the physician for evaluation prior to parathyroidectomy. A Tc99m-sestamibi scan shows two spots of increased uptake in the superior mediastinum. These spots represent structures that are most likely derived from which of the following embryological precursors?? A: 4th branchial pouch, B: 3rd branchial pouch, C: 2nd branchial arch, D: 4th branchial arch, E: 3rd branchial arch,  <response>: This is a question about embryological development of the parathyroid glands. The parathyroid glands develop from the third and fourth pharyngeal pouches. The Tc99m-sestamibi scan is showing increased uptake in two spots in the superior mediastinum, which likely represent parathyroid adenomas or hyperplasia. So the correct answer will be one of the choices derived from the third or fourth pharyngeal pouches.B: 3rd branchial pouch 