There has been an outbreak of infections caused by methicillin resistant Staphylococcus aureus in the surgical intensive care unit.The most effective means of limiting the spread is-

• A. Treatment with cephalosporins to which most strains are sensitive
• B. Treatment with naficillin and gentamicin,which have a synergistic effect
• C. Use of high-dose naficillin alone and isolation
• D. Treatment with glycopeptide