Tobacco consumption is known to stimulate secretion of adrenaline and nor-adrenaline. The component causing this could be

Options

A. nicotine
B. tannic acid
C. curaimin
D. catechin

Answer

To solve the question regarding the component in tobacco that stimulates the secretion of adrenaline and nor-adrenaline, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Components of Tobacco**:
- Tobacco contains various chemical compounds, but the most notable one is nicotine, which is an alkaloid.

2. **Understand the Role of Nicotine**:
- Nicotine is known to be a stimulant that affects the central nervous system. It increases the activity of neurotransmitters and hormones in the body.

3. **Link Nicotine to Adrenaline and Nor-adrenaline Secretion**:
- When nicotine is consumed, it stimulates the adrenal glands to secrete adrenaline (epinephrine) and nor-adrenaline (norepinephrine). These hormones are responsible for the 'fight or flight' response, which includes increased heart rate and alertness.

4. **Consider Other Components**:
- The question also mentions other components like tannic acid, curamine, and gatkin. However, these are not primarily known for stimulating the secretion of adrenaline and nor-adrenaline.

5. **Conclude with the Correct Answer**:
- Based on the above points, the component in tobacco that causes the stimulation of adrenaline and nor-adrenaline secretion is **nicotine**.

### Final Answer:
The component causing the stimulation of adrenaline and nor-adrenaline secretion due to tobacco consumption is **nicotine**.

---