38) ANSWER

B) Furosemide (Lasix)

Explanation

Treatment for hypermagnesemia is to promote urinary excretion of magnesium to decrease serum levels, so a diuretic might be indicated. Laxatives and antacids often contain magnesium, which could worsen the imbalance. Fluid restriction would be contraindicated, because it would prevent flushing of excess magnesium from the body. First, determine that the magnesium level is elevated. Eliminate option 1, since it is a source of magnesium. Eliminate option 4, since it would inhibit magnesium excretion, and option 3, because it is not useful.