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: Surgery
[{'content': 'TSH acts via : \nSelect and explain. \nA. cAMP formation., B. Direct stimulation, C. Receptor stimulation, D. All of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: When TSH is administered, thyroid function is stimulated, iodide uptake is increased and thyroxin synthesis and secretion is increased. TSH acts via cyclic AMP formation.', 'role': 'assistant'}]