Which of the following is a contrast medium used for x-rays of the digestive system?
a. barium
b. iron
c. magnesium
d. sodium
a
Explanation:
a. barium: correct
b. iron: is not used as a contrast medium for x-rays
c. magnesium: is not used as a contrast medium for x-rays
d. sodium: is not used as a contrast medium for x-rays
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