MRCP2-1049

A 35-year-old woman comes to the clinic with concerns about her sexual health. She reports experiencing vaginal dryness during intercourse and has noticed that her breasts leak milk with minimal stimulation. She also mentions that she has not had a period in the past 6 months. Her medical history includes recent use of metoclopramide for nausea. On examination, her blood pressure is 140/80 mmHg, pulse is 80/min and regular. She has some peripheral field visual loss. Laboratory results show elevated prolactin levels and abnormal thyroid function tests. Which of the following is the most likely diagnosis?