This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrine System, Subject name: Physiology
[{'content': 'Substrate controlled hormone is: \nSelect and explain. \nA. Glucagon, B. FSH, C. LH, D. TRH', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Blood glucose and amino acids are the substrates for glucagon. The levels of these substrates control the glucagon secretion. Glucagon secretion is stimulated by: Hypoglycemia, increase amino acids, stress, exercise, sympathetic stimulation Glucagon secretion is inhibited by: Insulin, increase blood glucose, somatostatin. Hypoglycemia is the most impoant stimulus. Protein rich meal and serum amino acids stimulate glucagon and insulin secretion. Arginine stimulates both glucagon and insulin secretion; alanine stimulates only glucagon secretion directly.', 'role': 'assistant'}]