Which of the following antibiotics is bactericidal ?

Options

A. Erthromycin
B. Tetracycline
C. Penicillin
D. Chloramphenicol

Explanation

To determine which of the following antibiotics is bactericidal, we need to understand the difference between bactericidal and bacteriostatic antibiotics.

### Step-by-Step Solution:

1. **Define Antibiotics**: Antibiotics are drugs used to treat bacterial infections. They can be classified into two categories: bactericidal and bacteriostatic.

2. **Understand Bactericidal vs. Bacteriostatic**:
- **Bactericidal Antibiotics**: These antibiotics kill bacteria directly. They are effective in eliminating the bacterial population.
- **Bacteriostatic Antibiotics**: These antibiotics inhibit the growth and reproduction of bacteria but do not kill them outright. They prevent bacteria from multiplying.

3. **Identify Examples**:
- **Bactericidal Antibiotics**: Examples include penicillin and ofloxacin.
- **Bacteriostatic Antibiotics**: Examples include erythromycin, chloramphenicol, and tetracycline.

4. **Analyze the Given Options**:
- If the question provides a list of antibiotics, we need to categorize each one based on the definitions above.
- For instance:
- Erythromycin: Bacteriostatic
- Tetracycline: Bacteriostatic
- Penicillin: Bactericidal
- Chloramphenicol: Bacteriostatic

5. **Select the Correct Answer**:
- From the analysis, penicillin is the only antibiotic listed that is bactericidal.

### Conclusion:
The correct answer to the question "Which of the following antibiotics is bactericidal?" is **Penicillin**.

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