Ergot, which is an important source of a drug is obtained from:

Options

A. Agaricus
B. Ephedra
C. Claviceps
D. Commiphora

Answer

To answer the question, "Ergot, which is an important source of a drug, is obtained from:", we will analyze the provided options step by step.

### Step-by-Step Solution:

1. **Understanding Ergot**:
- Ergot refers to a group of fungi that produce alkaloids, which are significant in medicine. The most notable species associated with ergot is *Claviceps purpurea*.

2. **Analyzing the Options**:
- **Option A: Agricus**
- This is a genus of mushrooms, commonly known as edible fungi. While they have health benefits, they are not related to ergot.
- **Option B: Ephedra**
- Ephedra is a genus of plants, specifically a type of gymnosperm. It is known for its medicinal properties, particularly in treating respiratory issues, but it does not produce ergot.
- **Option C: Claviceps**
- This is a genus of parasitic fungi. *Claviceps purpurea* specifically is known for producing ergot alkaloids, which can lead to ergotism in humans. This is the correct answer.
- **Option D: Commiphora**
- Commiphora is a genus of trees and shrubs known for their medicinal properties, but it is not related to ergot production.

3. **Conclusion**:
- After analyzing all the options, we can conclude that the correct answer is **Claviceps**. This genus is responsible for the production of ergot, which is an important source of medicinal drugs.

### Final Answer:
Ergot, which is an important source of a drug, is obtained from **Claviceps**.