This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Medicine
Dawn phenomenon refers to- 
Select and explain. 
A. Early morning hyperglycemia, B. Early morning hypolgycemia, C. Hypoglycemia followed by hyperglycemia, D. High insulin levels
A: Early morning hyperglycemia
Answer: A: Early morning hyperglycemia 
Explanation: Question repeated The dawn phenomenon, sometimes called the dawn effect, is an early-morning (usually between 2 a.m. and 8 a.m.) increase in blood sugar (glucose) relevant to people with diabetes. It is different from chronic Somogyi rebound in that dawn phenomenon is not associated with nocturnal hypoglycemia. The dawn phenomenon can be managed in many patients by avoiding carbohydrate intake at bedtime, adjusting the dosage of medication or insulin, switching to a different medication, or by using an insulin pump to administer extra insulin during early-morning hours. In most of the cases, there is no need to change insulin dosing of patients who encounter the dawn phenomenon.