## **Core Concept**
The question tests knowledge of antibiotic combinations, specifically those that include a beta-lactamase inhibitor and are available for oral administration. Beta-lactamase inhibitors are used to counteract bacterial resistance to beta-lactam antibiotics by inhibiting the beta-lactamase enzymes produced by bacteria.

## **Why the Correct Answer is Right**
The correct answer, . It combines amoxicillin (a beta-lactam antibiotic) with clavulanate (a beta-lactamase inhibitor). This combination works synergistically to extend the spectrum of amoxicillin to include bacteria that produce beta-lactamase enzymes, which would otherwise inactivate amoxicillin. The combination is orally available, making it convenient for outpatient treatment of various infections.

## **Why Each Wrong Option is Incorrect**
- **Option A:** This combination is not orally available; it is administered intravenously.
- **Option B:** This is a correct combination of a beta-lactam antibiotic (piperacillin) and a beta-lactamase inhibitor (tazobactam), but it is primarily administered intravenously, not orally.
- **Option C:** While sulbactam is a beta-lactamase inhibitor, its combination with ampicillin (another beta-lactam antibiotic) is usually administered parenterally (intravenously or intramuscularly), not orally.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that when selecting an antibiotic regimen, the route of administration is crucial, especially for outpatient treatment where oral medications are preferred. The combination of amoxicillin and clavulanate (**) is a commonly used oral regimen for treating a wide range of bacterial infections, including respiratory tract infections and urinary tract infections.

## **Correct Answer:** .