<prompt> Which is the most common cell involved in non-functioning pituitary adenoma?Gonadotropin producing cellProlactin producing cellGH producing cellTSH producing cell  <response>: 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. 