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: Medicine
[{'content': 'Pituitary tumor most responsive to medical therapy is - \nSelect and explain. \nA. Growth hormone secreting tumor, B. ACTH secreting tumor, C. Prolactinoma, D. Thyrotropin secreting tumors', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]