Caffeine, amphetamine and concaine are

Options

A. Sedatives
B. Tranquilizers
C. Stimulants
D. Hallucinogens

Answer

### Step-by-Step Solution:

1. **Understanding the Categories of Drugs**: First, we need to understand the four categories of drugs mentioned in the question: Sedatives, Tranquilizers, Stimulants, and Hallucinogens.
- **Sedatives**: These drugs slow down brain activity, helping to induce relaxation and sleep.
- **Tranquilizers**: These drugs reduce tension and anxiety, promoting a sense of calmness.
- **Stimulants**: These drugs activate brain function, increasing alertness, confidence, and energy levels.
- **Hallucinogens**: These drugs alter perception, thought, and feelings, often causing hallucinations.

2. **Identifying the Substances**: The substances in question are Caffeine, Amphetamine, and Cocaine. We need to categorize them based on their effects.
- **Caffeine**: A natural stimulant found in coffee and tea, known to increase alertness and energy.
- **Amphetamine**: A synthetic stimulant that enhances energy and alertness.
- **Cocaine**: A powerful natural stimulant that increases energy and alertness.

3. **Classifying the Substances**: Based on the definitions:
- All three substances (Caffeine, Amphetamine, and Cocaine) increase brain activity and make a person feel more energetic and alert.
- Therefore, they fit the definition of **Stimulants**.

4. **Conclusion**: The correct answer to the question is that Caffeine, Amphetamine, and Cocaine are classified as **Stimulants**.