Which of the following is not an antipyretic ?

Options

A. Paracetamol
B. Aspirin
C. Chloramphenicol
D. Phenacetin

Answer

To determine which of the following is not an antipyretic, we will analyze each option given in the question: Paracetamol, Aspirin, Chloramphenicol, and Phenacetin.

### Step 1: Define Antipyretics
Antipyretics are medications that help to reduce fever by lowering the body temperature. They are commonly used to treat conditions associated with fever.

### Step 2: Analyze Each Option
1. **Paracetamol**:
- Paracetamol, also known as Acetaminophen, is widely used to treat pain and fever. It is a well-known antipyretic.

2. **Aspirin**:
- Aspirin, chemically known as Acetyl Salicylic Acid, is used to relieve pain, reduce inflammation, and lower fever. Thus, it is also classified as an antipyretic.

3. **Chloramphenicol**:
- Chloramphenicol is an antibiotic, not an antipyretic. It is used to treat bacterial infections and does not have the property of reducing fever.

4. **Phenacetin**:
- Phenacetin is another antipyretic that was historically used to reduce fever and relieve pain. It is known for its antipyretic properties.

### Conclusion
From the analysis, **Chloramphenicol** is the only option that is not an antipyretic. It is an antibiotic used to treat infections rather than to reduce fever.

### Final Answer
Chloramphenicol is not an antipyretic.

---