A 30-year-old woman repos to the clinic for a routine physical examination. The examination reveals she is pregnant. Her plasma levels of TSH are high, but her total thyroid hormone concentration is normal. Which of the following best reflects the patient's clinical state?
A
Graves' disease
B
Hashimoto's disease
C
A pituitary tumor secreting TSH
D
A hypothalamic tumor secreting thyrotropin-releasing hormone (TRH)