Which of the following relaxes muscles and relieves anxiety?

Options

A. (a) Hallucinogens
B. (b) Tranquiliser
C. (c) Stimulants
D. (d) Opiates

Answer

To determine which substance relaxes muscles and relieves anxiety, we need to analyze the functions of each option provided.

### Step-by-Step Solution:

1. **Identify the Options**: The options given are hallucinogens, tranquilizers, stimulants, and opiates.

2. **Analyze Hallucinogens**:
- Hallucinogens alter a person's feelings, thoughts, and awareness.
- They act as psychoactive agents affecting serotonin levels in the brain.
- Example: LSD.
- **Conclusion**: Hallucinogens do not relax muscles or relieve anxiety. **(Incorrect option)**

3. **Analyze Tranquilizers**:
- Tranquilizers are known for relieving anxiety, fear, and tension.
- They act as sedative agents that relax body muscles and the brain.
- They provide a calming effect on the individual.
- Example: Benzodiazepines, which stimulate GABA receptors.
- **Conclusion**: Tranquilizers relax muscles and relieve anxiety. **(Correct option)**

4. **Analyze Stimulants**:
- Stimulants increase the speed of messages between the body and brain.
- They act as activating agents and increase the activity of the central nervous system (CNS).
- Example: Tea and coffee.
- **Conclusion**: Stimulants do not relax muscles or relieve anxiety; they have an energizing effect. **(Incorrect option)**

5. **Analyze Opiates**:
- Opiates relieve pain and inflammation and act as analgesic agents.
- They bind to opioid receptors in the brain and can have a calming effect.
- Example: Morphine.
- **Conclusion**: While opiates can have a calming effect, their primary function is pain relief, not muscle relaxation or anxiety relief. **(Incorrect option)**

6. **Final Conclusion**:
- After analyzing all options, the substance that relaxes muscles and relieves anxiety is **B. Tranquilizer**.

### Final Answer:
**B. Tranquilizer**