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': 'Which of the following statements about the action of the somatomedin is true? \nSelect and explain. \nA. They inhibit protein synthesis, B. They antagonize the effect of insulin, C. They promote growth of bone and cartilage, D. They mediate the local effects of Somatostatin', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]