Name the scientist who for the first time isolated and purified the enzyme urease in crystalline form from Jack bean (Canavalia ensiformis)

Options

A. Kuhne (1826)
B. Hayashi (1826)
C. Kurosawa (1926)
D. Sumner (1926)

Explanation

To answer the question about the scientist who first isolated and purified the enzyme urease in crystalline form from Jack bean (Canavalia ensiformis), we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Enzyme**: The enzyme in question is urease, which is responsible for the hydrolysis of urea into carbon dioxide and ammonia.

2. **Research the Scientists**: The question mentions several scientists: Hayashi, Kurosawa, and Sumner. We need to determine their contributions to the field of enzymology and specifically to urease.

3. **Evaluate Each Scientist**:
- **Hayashi**: Known for research on muscular contraction, not specifically related to urease.
- **Kurosawa**: Recognized for his work on a disease called foolish seedling, associated with a fungus, but not related to urease.
- **Sumner**: He is credited with the first successful isolation and purification of urease in crystalline form from Jack bean.

4. **Conclusion**: Based on the evaluations, the correct answer is **Sumner**, as he was the first to isolate and purify urease.

### Final Answer:
The scientist who first isolated and purified the enzyme urease in crystalline form from Jack bean (Canavalia ensiformis) is **Sumner**.

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