A 32-year-old African American mother brings her child to your clinic for a three-month checkup. Inquiring after his feeding habits, you find out that she failed to lactate. Her history is also...

A 32-year-old African American mother brings her child to your clinic for a three-month checkup. Inquiring after his feeding habits, you find out that she failed to lactate. Her history is also positive for fatigue, constipation, and amenorrhea since the birth of her child. She confirms that it was a difficult birth, and that she required a large transfusion of blood. What is the likely cause of her symptoms?

A. Sarcoidosis

B. Pituitary apoplexy

C. Hypothyroid

D. Sheehan syndrome