Problem: A 33-year-old woman presents with complaints of constipation and fatigue. A laboratory workup identifies a thyroid-stimulating hormone (TSH) level of 8.0 (0.4-3.8 mIU/L) and a free T4 level of 1.2 (0.8-2.8 ng/dL). The most likely diagnosis is: - A) subclinical hyperthyroidism - B) primary hyperthyroidism - C) subclinical hypothyroidism