A fodder plant is

Options

A. Medicago sativa
B. Melilotus indica
C. Trifolium alexandrinum
D. All the above.

Answer

**Step-by-Step Solution:**

1. **Understanding Fodder Plants**: Fodder plants are those that are cultivated specifically to feed livestock. They are an essential part of animal husbandry and agriculture.

2. **Evaluating the Options**:
- **Option 1: Medicago sativa (Alfalfa)**: This is a perennial flowering plant belonging to the legume family (Fabaceae). It is widely recognized as an important fodder crop due to its high nutritional value and is cultivated in many countries.

- **Option 2: Melilotus indica**: This is an annual herb with yellow flowers, native to regions in Africa, Europe, and Asia. It is also used as fodder and has additional benefits in agriculture, such as soil improvement.

- **Option 3: Trifolium alexandrinum (Egyptian Clover)**: This annual flowering plant is primarily grown in subtropical regions and is known for its use as fodder for cattle and enhancing milk production in buffaloes.

3. **Conclusion**: All three options provided (Medicago sativa, Melilotus indica, and Trifolium alexandrinum) are recognized as fodder plants. Therefore, the correct answer to the question "A fodder plant is" would be **all of the above**.

---