Which of the following is a sign of hyperglycaemia?

Frequent urination is a well-known sign of hyperglycaemia, which refers to higher than normal levels of glucose in the blood. When blood glucose levels rise significantly, the kidneys attempt to excrete the excess sugar through urine, leading to increased urination. This process can lead to dehydration and may compound the symptoms associated with hyperglycaemia.

The other options, such as dizziness, hunger, and nervousness, can potentially be associated with a range of conditions, including low blood sugar (hypoglycaemia) or stress responses, and are not specific indicators of hyperglycaemia. Frequent urination specifically highlights the body's attempt to manage elevated blood glucose levels, making it the most indicative sign of hyperglycaemia in this context.