Some protection is provided against carcinogens by

Options

A. Penicillic acid
B. Afflatoxin
C. Streptomycin
D. Tocopherol/vit.E.

Answer

### Step-by-Step Solution:

1. **Understanding Carcinogens**:
- Carcinogens are substances that can lead to cancer by causing changes in cellular DNA. They can be chemical compounds, physical agents, or biological agents.

**Hint**: Remember that carcinogens are linked to cancer development.

2. **Analyzing the Options**:
- The options provided are:
- A) Penicillic acid
- B) Aflatoxin
- C) Streptomycin
- D) Tocopherol (Vitamin E)

3. **Evaluating Each Option**:
- **Penicillic Acid**: This is derived from the fungus Penicillium notatum and is known as an antibiotic. It does not provide protection against carcinogens.
- **Aflatoxin**: This is a known carcinogen produced by certain molds. It does not provide protection; rather, it is harmful.
- **Streptomycin**: Another antibiotic, which is used to treat bacterial infections. It does not offer protection against carcinogens.
- **Tocopherol (Vitamin E)**: This is a fat-soluble vitamin that has antioxidant properties. It helps in protecting cells from oxidative damage, which can reduce the risk of cancer.

4. **Identifying the Correct Answer**:
- Among the options, only tocopherol (Vitamin E) is known to provide some level of protection against carcinogens due to its antioxidant properties.

5. **Conclusion**:
- The correct answer is **D) Tocopherol (Vitamin E)**.