This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Physiology
[{'content': 'Acromegaly is a disorder of: \nSelect and explain. \nA. Excess growth hormone secretion during adulthood, B. Excess thyroxine secretion, C. Excess ACTH secretion, D. Excess FSH secretion', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]