Consider the following antibiotics
(i) Erythromycin
(ii) Ofloxacin
(iii) Chloramphenicol
(iv) Penicillin
The pair of bactericidal antibodies is

Options

A. `i-iii`
B. `ii-iv`
C. `ii-v`
D. `i-iv`

Answer

To determine the pair of bactericidal antibiotics from the given list, we need to understand the classification of antibiotics into two main categories: bactericidal and bacteriostatic.

### Step-by-Step Solution:

1. **Understanding Antibiotic Types**:
- **Bactericidal Antibiotics**: These antibiotics kill bacteria directly.
- **Bacteriostatic Antibiotics**: These antibiotics inhibit the growth and reproduction of bacteria but do not kill them outright.

2. **Analyzing the Given Antibiotics**:
- **Erythromycin**: This is primarily a bacteriostatic antibiotic. It inhibits protein synthesis in bacteria.
- **Ofloxacin**: This is a bactericidal antibiotic. It works by inhibiting DNA gyrase, which is essential for bacterial DNA replication.
- **Chloramphenicol**: This is also a bacteriostatic antibiotic. It inhibits protein synthesis by blocking peptide bond formation.
- **Penicillin**: This is a classic example of a bactericidal antibiotic. It works by inhibiting the synthesis of bacterial cell walls.

3. **Identifying Bactericidal Antibiotics**:
- From the analysis, we find that Ofloxacin and Penicillin are the two antibiotics that are bactericidal.

4. **Conclusion**:
- The pair of bactericidal antibiotics from the given options is **(ii) Ofloxacin and (iv) Penicillin**.

### Final Answer:
The pair of bactericidal antibiotics is **Ofloxacin and Penicillin**.

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