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 options, we need to understand the classification of the antibiotics listed:

1. **Erythromycin**: This is a macrolide antibiotic that primarily acts as a bacteriostatic agent, meaning it inhibits the growth of bacteria rather than killing them outright.

2. **Ofloxacin**: This is a fluoroquinolone antibiotic that is considered bactericidal. It works by inhibiting bacterial DNA gyrase, leading to the death of the bacteria.

3. **Chloramphenicol**: This antibiotic is generally bacteriostatic, as it inhibits protein synthesis in bacteria, preventing their growth.

4. **Penicillin**: This is a well-known bactericidal antibiotic that works by inhibiting the synthesis of bacterial cell walls, leading to cell lysis and death.

Now, we need to identify which of these antibiotics are bactericidal:

- **Bactericidal antibiotics**: Ofloxacin and Penicillin.
- **Bacteriostatic antibiotics**: Erythromycin and Chloramphenicol.

From this analysis, we can conclude that the pair of bactericidal antibiotics among the options provided is:

**Answer**: Ofloxacin (ii) and Penicillin (iv).

Thus, the correct answer is option number 2 (ii and iv).