Caffeine, amphetamine and concaine are

Options

A. Nerve depressants
B. Nerve initiators
C. Nerve stimulants
D. Nerve impulse initiators

Answer

To solve the question regarding caffeine, amphetamine, and cocaine, we need to analyze the nature of these substances and their effects on the nervous system.

### Step-by-Step Solution:

1. **Identify the substances**: The question lists three substances: caffeine, amphetamine, and cocaine.

2. **Classify the substances**:
- **Caffeine**: A natural stimulant found in coffee and tea, known to increase alertness and reduce fatigue.
- **Amphetamine**: A synthetic stimulant that enhances focus and energy levels, often used in the treatment of ADHD.
- **Cocaine**: A powerful natural stimulant derived from coca leaves, known for its intense euphoric effects and potential for addiction.

3. **Understand their effects**: All three substances stimulate the central nervous system (CNS), leading to increased alertness, energy, and sometimes euphoria. They do not depress the nervous system.

4. **Determine the correct classification**:
- The options provided are:
- A) Nerve depressant
- B) Nerve initiator
- C) Nerve stimulants
- D) Nerve impulse initiator
- Given that caffeine, amphetamine, and cocaine increase CNS activity, they are best classified as "nerve stimulants."

5. **Select the correct answer**: The correct option is C) nerve stimulants.

### Final Answer:
Caffeine, amphetamine, and cocaine are classified as **C) nerve stimulants**.

---