<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:An 8-year-old girl is brought to the physician because of a progressive swelling of her neck for the past 6 months. She has no pain, dyspnea, or dysphagia. She is at the 60th percentile for height and the 55th percentile for weight. Vital signs are within normal limits. Examination shows a 3-cm cystic, nontender swelling in the midline of the neck. The swelling moves upwards on protrusion of the tongue. There is no cervical lymphadenopathy. Her serum thyroid-stimulating hormone level is 2.1 μUmL. Which of the following is the most appropriate next step in management?? A: Excision of the cyst, track and hyoid bone, B: Ultrasonography of the neck, C: CT scan of the neck, D: Excision of the cyst, E: Thyroid scintigraphy,  <response>: This is a clinical case about a young girl with a neck swelling that is likely a thyroglossal duct cyst based on the description. The key findings are a midline cystic neck mass that moves up with tongue protrusion, no lymphadenopathy, and normal thyroid function tests. The next step should be imaging to confirm the diagnosis. Ultrasonography is the initial imaging modality of choice for evaluating a suspected thyroglossal duct cyst. CT scan exposes the child to unnecessary radiation and is not required. Thyroid scintigraphy is used to evaluate thyroid function rather than anatomy. Excision is premature without confirming the diagnosis first. The most extensive surgical approach involving hyoid bone resection is usually not required.B: Ultrasonography of the neck 