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 cell involved in non-functioning pituitary adenoma? \nSelect and explain. \nA. Gonadotropin producing cell, B. Prolactin producing cell, C. GH producing cell, D. TSH producing cell', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A majority of pituitary adenomas are clinically non-functioning and produce no distinct clinical hyper-secretory syndrome. Some of them arise from gonadotrope cells and may secrete intact circulating gonadotropins. most common cell involved in Non-functioning pituitary adenoma is Gonadotropin producing cell. The most common Secretory adenoma is Prolactinoma. The least common secretory adenoma is TSH secreting tumor.', 'role': 'assistant'}]