The addictive chemical present in tobacco is

Options

A. (a) Caffeine
B. (b) nicotine
C. (c) catechol
D. (d) carbon monoxide.

Explanation

To determine the addictive chemical present in tobacco, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Concept of Addictive Chemicals**:
- Addictive chemicals can be either synthesized or derived from plants. They lead to a chronic mental disorder characterized by compulsive use despite harmful effects.

2. **Analyze the Options Given**:
- A) Caffeine: Commonly found in coffee and soft drinks.
- B) Nicotine: A chemical found in tobacco.
- C) Catechol: Found in tea.
- D) Carbon Monoxide: A gas that can be produced from burning substances, but not specifically an addictive chemical in this context.

3. **Identify the Correct Option**:
- Among the options, nicotine is specifically known for its presence in tobacco and is recognized for its addictive properties.

4. **Conclude the Answer**:
- Therefore, the addictive chemical present in tobacco is **B) Nicotine**.