During Normal Routine of Newborn Screening, There Are a Low

During normal routine of newborn screening, there are a low thyroxin level with normal TSH. The patient was born by cesarean section due to breach presentation. During the pregnancy, the mother took acetaminophen intermittently for low back pain. Examination of the newborn shows no abnormal findings. Which of the following is the most likely cause of the patient's abnormal thyroid function tests?

A) Decreased T4 to triiodothyronine conversion
B) Deficiency of thyroxine-binding globulin
C) Hypoalbuminemia
D) Hypopituitarism
E) Thyroid dysgenesis

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