Uriniferous/nephrons tubules occurs in
(a) Stomach
(b) Testes
(c) Ovary
(d) Kidney

Options

A. Stomach
B. Testes
C. Ovary
D. Kidney

Answer

To solve the question regarding where uriniferous/nephron tubules occur, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question asks where uriniferous or nephron tubules are found among the given options: stomach, testes, ovary, and kidney.

2. **Define Uriniferous Tubules**: Uriniferous tubules, also known as nephron tubules, are the functional units of the kidney. They play a crucial role in the excretion of waste and the regulation of water and electrolytes in the body.

3. **Identify the Structure of Nephrons**: Nephrons consist of several parts:
- **Renal Corpuscle**: This includes the Bowman's capsule and glomerulus.
- **Proximal Convoluted Tubule (PCT)**: The first segment of the nephron tubule.
- **Loop of Henle**: A U-shaped part of the nephron.
- **Distal Convoluted Tubule (DCT)**: The segment following the loop of Henle.
- **Collecting Duct**: Also referred to as the uriniferous tubule.

4. **Analyze Each Option**:
- **(a) Stomach**: The stomach is involved in digestion, not in urine formation.
- **(b) Testes**: The testes are reproductive organs, not involved in excretion.
- **(c) Ovary**: The ovaries are also reproductive organs and do not have nephron tubules.
- **(d) Kidney**: The kidneys contain nephrons, which include uriniferous tubules.

5. **Conclusion**: Based on the analysis, the correct answer is (d) Kidney, as this is the only organ that contains uriniferous/nephron tubules.

### Final Answer:
**(d) Kidney**