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: Biochemistry
[{'content': 'HMG Co A production in liver is inhibited by \nSelect and explain. \nA. Insulin, B. Thyroxine, C. Glucagon, D. Cortisol', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Insulin', 'role': 'assistant'}]