Which of the following is a symptom of hypoglycemia?

Tremor is a recognized symptom of hypoglycemia, which occurs when the blood glucose level falls below normal. This condition triggers the body's fight-or-flight response due to the lack of glucose, which is a vital energy source for the brain. The release of adrenaline in response to low blood sugar can lead to physical symptoms such as tremors, anxiety, sweating, and palpitations.

In contrast, increased thirst, dry skin, and frequent urination are typically associated with hyperglycemia (high blood sugar levels) or diabetes rather than hypoglycemia. Increased thirst and frequent urination are particularly linked to the body's attempts to manage excess glucose levels by flushing it out through urine, while dry skin can occur due to dehydration resulting from elevated blood sugar levels. Therefore, tremor stands out as a specific and recognized symptom of hypoglycemia.