Which of the following is an example of broad spectrum antibiotic ?

Options

A. Penicillin G
B. Chloramphenicol
C. Streptomycin
D. Ampicillin

Answer

To determine which of the following is an example of a broad-spectrum antibiotic, we need to analyze the options provided: Penicillin G, Chloramphenicol, Streptomycin, and Ampicillin.

### Step-by-Step Solution:

1. **Understand the Definition of Broad-Spectrum Antibiotics**:
- Broad-spectrum antibiotics are those that are effective against a wide variety of bacteria, including both Gram-positive and Gram-negative bacteria.

2. **Evaluate Each Option**:
- **Penicillin G**: This antibiotic is primarily effective against Gram-positive bacteria and is considered a narrow-spectrum antibiotic.
- **Chloramphenicol**: This antibiotic is effective against a wide range of bacteria, including both Gram-positive and Gram-negative bacteria, making it a broad-spectrum antibiotic.
- **Streptomycin**: This antibiotic is also effective against a wide variety of bacteria, particularly Gram-negative bacteria, and is classified as a broad-spectrum antibiotic.
- **Ampicillin**: This is another broad-spectrum antibiotic that is effective against both Gram-positive and Gram-negative bacteria.

3. **Identify the Broad-Spectrum Antibiotics**:
- Based on the evaluations:
- **Chloramphenicol**: Broad-spectrum
- **Streptomycin**: Broad-spectrum
- **Ampicillin**: Broad-spectrum
- **Penicillin G**: Narrow-spectrum

4. **Conclusion**:
- The broad-spectrum antibiotics among the options are **Chloramphenicol, Streptomycin, and Ampicillin**. Therefore, the correct answer includes these three antibiotics.

### Final Answer:
The examples of broad-spectrum antibiotics from the given options are **Chloramphenicol, Streptomycin, and Ampicillin**.