The substance that causes addiction to tabacco is:

Options

A. nicotine
B. cocaine
C. caffeine
D. none of these

Answer

**Step-by-Step Solution:**

1. **Identify the Question**: The question asks for the substance that causes addiction to tobacco.

2. **Review the Options**: The options provided are:
- A) Nicotine
- B) Cocaine
- C) Caffeine
- D) None of these

3. **Analyze Each Option**:
- **Option A: Nicotine**: This is a chemical found in tobacco products that is known to be addictive. It is absorbed into the bloodstream through the lungs and spreads quickly throughout the body. Nicotine creates pleasant feelings and distracts users from unpleasant emotions, which contributes to its addictive nature.
- **Option B: Cocaine**: This is a strong stimulant derived from coca leaves and is not related to tobacco addiction. It is commonly used as a recreational drug.
- **Option C: Caffeine**: This is a central nervous system stimulant but is not associated with tobacco addiction. It is widely used as a psychoactive drug.
- **Option D: None of these**: This option implies that none of the substances listed cause tobacco addiction, which is incorrect.

4. **Conclusion**: Based on the analysis, the substance that causes addiction to tobacco is **Nicotine** (Option A).

5. **Final Answer**: The correct answer is **A) Nicotine**.

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