Review Question - QID 109030

A 45-year-old male comes to the physician’s office with complaints of increased thirst, appetite, and urinary frequency. He has had these complaints for a few months and has recently noticed an ulcer on his foot. He does not have any previous medical history and cannot recall having these symptoms previously. He drinks socially and has smoked half a pack a day for the last 25 years. The factor most likely involved in the pathogenesis of this disease is produced by which of the cells shown in Figure A?