**Core Concept**
Adrenal deficiency, also known as Addison's disease, is a condition where the adrenal glands do not produce sufficient cortisol and/or aldosterone hormones. Cortisol plays a crucial role in maintaining blood sugar levels, blood pressure, and the body's response to stress. Aldosterone, on the other hand, regulates electrolyte balance and blood pressure.

**Why the Correct Answer is Right**
Hypocalcemia, or low calcium levels, is not typically associated with adrenal deficiency. This is because the adrenal glands do not directly influence calcium metabolism. In contrast, cortisol and aldosterone deficiencies can lead to hypoglycemia (low blood sugar), hypotension (low blood pressure), and hyponatremia (low sodium levels). Cortisol stimulates gluconeogenesis, which increases blood glucose levels, whereas aldosterone promotes sodium retention, which helps maintain blood pressure.

**Why Each Wrong Option is Incorrect**
**Option A:** Hypoglycemia is a correct consequence of adrenal deficiency due to impaired gluconeogenesis and increased glucose utilization.
**Option C:** Hypotension is a potential consequence of adrenal deficiency, particularly in the context of aldosterone deficiency, which disrupts sodium and water balance.
**Option D:** Hyponatremia, or low sodium levels, can occur in adrenal deficiency due to the impaired ability of the kidneys to reabsorb sodium.

**Clinical Pearl / High-Yield Fact**
In adrenal deficiency, patients may present with non-specific symptoms such as fatigue, weight loss, and hyperpigmentation. It is essential to consider this diagnosis in patients with unexplained hypotension, hyponatremia, or hypoglycemia.

**✓ Correct Answer: B. Hypocalcemia**