Among the following, the narrow spectrum antibiotic is

Options

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

Explanation

To determine which of the given options is a narrow spectrum antibiotic, we will analyze each option based on the definition of narrow spectrum antibiotics.

### Step-by-Step Solution:

1. **Understand Narrow Spectrum Antibiotics**:
- Narrow spectrum antibiotics are those that are effective against a limited range of bacteria. They target specific types of bacteria rather than a broad range.

2. **Analyze the Options**:
- **Chloramphenicol**: This is a broad spectrum antibiotic, effective against a wide variety of bacteria.
- **Penicillin G**: This is known to be effective primarily against gram-positive bacteria and some gram-negative bacteria, making it a narrow spectrum antibiotic.
- **Ampicillin**: This is a broad spectrum antibiotic, effective against a wider range of bacteria than Penicillin G.
- **Amoxicillin**: Similar to Ampicillin, it is also a broad spectrum antibiotic.

3. **Identify the Narrow Spectrum Antibiotic**:
- From the analysis, Penicillin G is the only option that fits the definition of a narrow spectrum antibiotic.

4. **Conclusion**:
- Therefore, the answer to the question is **Penicillin G** (Option B).

### Final Answer:
**Penicillin G (Option B)** is the narrow spectrum antibiotic among the given options.