Which of the following drugs is most effective against an organism producing aminoglycoside inactivating enzymes ?
**Core Concept**
The question tests the student's knowledge of antibiotic resistance mechanisms, specifically aminoglycoside inactivating enzymes, which are enzymes produced by certain bacteria that inactivate aminoglycoside antibiotics by modifying their structure.
**Why the Correct Answer is Right**
The correct answer is a drug that is not affected by aminoglycoside inactivating enzymes. Aminoglycosides are a class of antibiotics that work by inhibiting protein synthesis. However, bacteria can produce enzymes that modify the aminoglycoside molecule, rendering it ineffective. The correct answer is a drug that uses a different mechanism of action, making it resistant to inactivation by these enzymes.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is likely a type of aminoglycoside antibiotic, which would be inactivated by the enzymes produced by the bacteria.
* **Option B:** This option is also a type of aminoglycoside antibiotic, which would be affected by the aminoglycoside inactivating enzymes.
* **Option D:** This option is another type of antibiotic that may not be effective against bacteria producing aminoglycoside inactivating enzymes.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that aminoglycoside inactivating enzymes are a common mechanism of resistance in certain bacteria, such as Acinetobacter and Pseudomonas species. Therefore, choosing an antibiotic that is not affected by these enzymes is crucial for effective treatment.
**Correct Answer:** C.