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: Physiology
GH secretion is 
Select and explain. 
A. Greater in early morning, B. Greater in evening, C. Increases on preolonged fasting, D. Stimulates B-cells of pancreases directly
C: Increases on preolonged fasting
Answer: C: Increases on preolonged fasting 
Explanation: Peptide hormones. ... Sex hormones. ... Clonidine and L-DOPA by stimulating GHRH release. a4b2 nicotinic agonists, including nicotine, which also act synergistically with clonidine. Hypoglycemia, arginine and propranolol by inhibiting somatostatin release. Deep sleep. Insulin. Ref: guyton and hall textbook of medical physiology 12 edition page number: 550,551,552