Pigeon Pea is

Options

A. Cajanus cajan
B. Vigna unguiculata
C. Phaseolus vulgaris
D. Vigna radiata.

Answer

### Step-by-Step Solution:

1. **Identify the Question**: The question asks about the classification of Pigeon Pea.

2. **List the Options**: The options provided are:
- A) Cajanus cajan
- B) Vigna anguiculata
- C) Phaseolus vulgaris
- D) Vigna radiata

3. **Research Each Option**:
- **A) Cajanus cajan**: This is the scientific name for Pigeon Pea, which is indeed a legume.
- **B) Vigna anguiculata**: This is known as Cowpea or Black-eyed Pea, which is not Pigeon Pea.
- **C) Phaseolus vulgaris**: This is known as Common Bean or French Bean, which is also not Pigeon Pea.
- **D) Vigna radiata**: This is known as Moong Bean, which is again not Pigeon Pea.

4. **Conclusion**: Based on the identification and classification, the correct answer is **A) Cajanus cajan**.