43) ANSWER

D) A 62-year-old male with chronic renal failure

Explanation

Renal failure interferes with excretion of electrolytes, including magnesium. All of the conditions listed in the incorrect options increase the risk of hypomagnesemia by interfering with magnesium absorption in the small intestine. Critical words are hypermagnesemia and risk. Eliminate options 1 and 2, since intake of magnesium is reduced in these conditions. Recall that magnesium is absorbed in the small intestine, and eliminate option 3.