Drug of choice for anaerobic infection is
**Core Concept**
Anaerobic infections are caused by bacteria that thrive in environments devoid of oxygen. The drug of choice for treating such infections should have properties that allow it to penetrate deep tissue and remain effective against anaerobic bacteria.
**Why the Correct Answer is Right**
The primary treatment for anaerobic infections involves the use of beta-lactam antibiotics, specifically beta-lactamase-stable agents. **Metronidazole** is the drug of choice for anaerobic infections, particularly for those caused by *Bacteroides fragilis* and other anaerobic gram-negative rods. Metronidazole's mechanism of action involves the inhibition of DNA synthesis in bacteria, ultimately leading to cell death. Its efficacy in anaerobic infections is due to its ability to penetrate tissues effectively and its resistance to degradation by beta-lactamase enzymes.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as it does not specify a particular drug that is effective against anaerobic infections.
**Option B:** This option is incorrect as it does not provide a drug that is commonly used to treat anaerobic infections.
**Option C:** This option is incorrect as it is not the drug of choice for anaerobic infections.
**Clinical Pearl / High-Yield Fact**
In the treatment of anaerobic infections, it is essential to note that metronidazole is often combined with other antibiotics, such as penicillins or cephalosporins, to provide broad-spectrum coverage against both anaerobic and aerobic bacteria.
**Correct Answer:** C. Metronidazole