Which of the following is used as an antibiotic?

Options

A. ciprofloxacin
B. paracetamol
C. ibuprofen
D. tocopherol

Explanation

To determine which of the following substances is used as an antibiotic, we will analyze each option provided: Ciprofloxacin, Paracetamol, Ibuprofen, and Tocopherol.

### Step-by-Step Solution:

1. **Identify the first option: Ciprofloxacin**
- Ciprofloxacin is known to be an antibiotic. It is commonly used to treat various bacterial infections, including urinary tract infections (UTIs) and some skin infections. Therefore, Ciprofloxacin is indeed an antibiotic.

2. **Identify the second option: Paracetamol**
- Paracetamol, also known as acetaminophen, is primarily an antipyretic and analgesic medication. It is used to reduce fever and relieve pain but does not have antibiotic properties. Thus, Paracetamol is not an antibiotic.

3. **Identify the third option: Ibuprofen**
- Ibuprofen is classified as a non-steroidal anti-inflammatory drug (NSAID). It is primarily used to relieve pain and reduce inflammation and fever. Like Paracetamol, it does not possess antibiotic properties. Therefore, Ibuprofen is not an antibiotic.

4. **Identify the fourth option: Tocopherol**
- Tocopherol is known as Vitamin E, which is a fat-soluble antioxidant. It is not used as an antibiotic and is primarily involved in protecting cells from oxidative stress. Thus, Tocopherol is not an antibiotic.

### Conclusion:
Based on the analysis of all four options, **Ciprofloxacin** is the only substance among the given choices that is used as an antibiotic.