**Core Concept**
Beta-lactamase resistant penicillins are a class of antibiotics that have been designed to evade the action of beta-lactamase enzymes produced by certain bacteria. These enzymes degrade the beta-lactam ring of penicillins, rendering them ineffective. Beta-lactamase resistant penicillins achieve this resistance through chemical modifications that make them less susceptible to beta-lactamase degradation.

**Why the Correct Answer is Right**
The correct answer is a beta-lactamase resistant penicillin that has a modified side chain, which makes it less susceptible to beta-lactamase degradation. This modification allows the antibiotic to retain its effectiveness against bacteria that produce beta-lactamase enzymes.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it is a beta-lactamase sensitive penicillin. Beta-lactamase sensitive penicillins are susceptible to degradation by beta-lactamase enzymes and are therefore less effective against bacteria that produce these enzymes.

**Option B:** This option is incorrect because it is a cephalosporin, not a penicillin. While cephalosporins are a related class of beta-lactam antibiotics, they are not penicillins.

**Option D:** This option is incorrect because it is a carbapenem, not a penicillin. Carbapenems are a class of beta-lactam antibiotics that are resistant to beta-lactamase degradation, but they are not penicillins.

**Clinical Pearl / High-Yield Fact**
When choosing an antibiotic, it is essential to consider the local resistance patterns and the specific characteristics of the pathogen. Beta-lactamase resistant penicillins are often used in situations where beta-lactamase production is suspected or confirmed.

**Correct Answer:** C.