This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Disorders of pituitary gland, Subject name: Medicine
[{'content': 'Which is the most common functioning tumour of pituitary? \nSelect and explain. \nA. GH secreting tumor, B. Prolactinoma, C. ACTH producing adenoma, D. Oncocytoma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: MC Functioning tumour of pituitary: Prolactinoma MC tumor of pituitary: Non- functioning adenoma', 'role': 'assistant'}]