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': 'Hormone released during increased stress is: \nSelect and explain. \nA. Cortisol, B. Thyroxine, C. Growth hormone, D. Somatostatin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]