`.^(**)`Which is finally reabsorbed in distal convoluted tubule

Options

A. Calcium
B. Potassium
C. Bicarbonate
D. Water

Explanation

To answer the question "Which is finally reabsorbed in the distal convoluted tubule?", we need to understand the process of reabsorption in the nephron, specifically in the distal convoluted tubule (DCT).

### Step-by-Step Solution:

1. **Understand the Structure of the Nephron**:
- The nephron is the functional unit of the kidney and consists of several parts: the glomerulus, proximal convoluted tubule (PCT), loop of Henle, distal convoluted tubule (DCT), and collecting duct.

2. **Identify the Role of Each Part**:
- The PCT is responsible for the reabsorption of approximately 90% of the filtrate, including water, glucose, amino acids, and ions.
- The loop of Henle further concentrates the urine and reabsorbs some water and salts.
- The DCT is where the remaining 10% of reabsorption occurs.

3. **Focus on the Distal Convoluted Tubule**:
- In the DCT, specific substances are reabsorbed. This includes ions and bicarbonates.
- The DCT is less involved in the reabsorption of water compared to the PCT and loop of Henle.

4. **Identify the Key Substance Reabsorbed in the DCT**:
- Among the substances reabsorbed in the DCT, bicarbonates are specifically mentioned as being reabsorbed here. This is crucial for maintaining acid-base balance in the body.

5. **Conclusion**:
- Therefore, the correct answer to the question is that bicarbonates are the substances that are finally reabsorbed in the distal convoluted tubule.

### Final Answer:
The substance that is finally reabsorbed in the distal convoluted tubule is **bicarbonate**.

---