Infections caused by gram-negative bacilli are often treated with

Infections make happen by gram-negative bacilli are often treated with aminoglycosides. The aminoglycosides are a types of antibiotics used mostly in the dealing of aerobic gram-negative bacilli contagions though they are also in effect in contradiction of other bacteria containing staphylococci and mycobacterium tuberculosis. 

Since we don't see a strand; i got answers off a sheet and the correct answer is "2".