Which of the following is mainly reabsorbed from the distal convoluted tubule of a nephron?

Options

A. Water
B. Urea
C. Glucose
D. NaCl

Explanation

To solve the question "Which of the following is mainly reabsorbed from the distal convoluted tubule of a nephron?", we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Function of the Distal Convoluted Tubule (DCT)**:
- The DCT is a part of the nephron in the kidney that plays a crucial role in the reabsorption of various substances.

2. **Identify What is Reabsorbed in the DCT**:
- The DCT is primarily involved in the reabsorption of ions, particularly sodium ions (Na+), chloride ions (Cl-), and calcium ions (Ca2+).

3. **Consider the Permeability of the DCT**:
- It is important to note that the DCT is impermeable to water, meaning that water is not reabsorbed here. This is a key characteristic that differentiates it from other parts of the nephron, such as the collecting duct.

4. **Evaluate the Options Given**:
- Since the question presents multiple options (not specified here), we need to focus on the ions and salts that are typically reabsorbed in the DCT. The main ions that are reabsorbed include sodium (Na+) and chloride (Cl-).

5. **Conclude the Answer**:
- Based on the information gathered, the main substance that is reabsorbed from the DCT is sodium chloride (NaCl), as it consists of sodium ions and chloride ions.

### Final Answer:
The substance mainly reabsorbed from the distal convoluted tubule of a nephron is **sodium chloride (NaCl)**.

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