The thyroid gland is visualized easily on CT sectional images of the neck because
A. it is adjacent to the internal jugular vein, so it absorbs contrast that is administered intravenously.
B. it is adjacent to the common carotid artery, so it absorbs contrast that is administered intravenously.
C. its density is similar to cartilage.
D. it naturally contains iodine.
Answer: D
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