**Core Concept**
The patient's presentation of hypertension and a thyroid nodule raises the suspicion of a pheochromocytoma (a catecholamine-secreting tumor) associated with multiple endocrine neoplasia type 2 (MEN2) syndrome, which also includes medullary thyroid carcinoma. The presence of a thyroid nodule and hypertension warrants further investigation to rule out these conditions.

**Why the Correct Answer is Right**
Urine VMA (vanillylmandelic acid) is a metabolite of catecholamines, and measuring its levels can help diagnose pheochromocytoma. Aspiration of the thyroid nodule is necessary to diagnose medullary thyroid carcinoma, which secretes calcitonin. This approach addresses both potential conditions suggested by the patient's presentation. The medullary thyroid carcinoma can be confirmed by histopathological examination of the aspirated tissue, and the presence of pheochromocytoma can be ruled out or confirmed by the results of the urine VMA test.

**Why Each Wrong Option is Incorrect**
**Option A:** Urine HIAA (5-hydroxyindoleacetic acid) levels are used to diagnose carcinoid syndrome, which is not directly related to the patient's presentation of hypertension and a thyroid nodule.

**Option C:** Ultrasound abdomen may be useful in evaluating other abdominal organs but is not the next step in managing this patient's presentation.

**Option D:** Echocardiography may be useful in evaluating the patient's hypertension but is not the next step in diagnosing the underlying cause of the thyroid nodule and hypertension.

**Clinical Pearl / High-Yield Fact**
In patients with a thyroid nodule and hypertension, it's essential to consider the possibility of pheochromocytoma and medullary thyroid carcinoma, and to investigate both conditions simultaneously to avoid missing a diagnosis.

**✓ Correct Answer: B. Urine VMA and aspiration of the thyroid nodule**