An analgesic is a:

Answer

### Step-by-Step Solution:

1. **Understanding the Term "Analgesic":**
- An analgesic is a type of medication used to relieve pain. It is important to know that analgesics do not cure the underlying condition causing the pain but simply alleviate the sensation of pain.

2. **Identifying the Function of Analgesics:**
- The primary function of analgesics is to provide pain relief. This can include various types of pain, such as headaches, muscle aches, arthritis, and more.

3. **Reviewing the Options:**
- The question provides several options to choose from:
- a) Pain-causing drug
- b) Fatigue-causing drug
- c) Pain-relieving drug

4. **Evaluating Each Option:**
- Option a) "Pain-causing drug" is incorrect because analgesics are meant to relieve pain, not cause it.
- Option b) "Fatigue-causing drug" is also incorrect as analgesics do not primarily cause fatigue.
- Option c) "Pain-relieving drug" is correct because it accurately describes the function of analgesics.

5. **Conclusion:**
- Based on the evaluation, the correct answer is option c) "Pain-relieving drug."