A patient goes to her doctor, complaining of fatigue, weight gain, and intolerance to cold. She also has a noticeable goiter in her neck. Which of the following is a most likely diagnosis and cause?
A. She has hyperthyroidism, possibly due to a hypersecreting tumor of the anterior pituitary gland.
B. She has hypothyroidism, possibly due to low iodine in her diet.
C. She has hypothyroidism, possibly due to destruction of thyrotrope cells of her anterior pituitary gland.
D. She has hyperthyroidism, possibly due to Graves' disease.
Answer: B
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