During `CO_(2)` transport, `HCO_(3)^(-)` diffuses from erythrocytes to plasma and in turn upsets the ionic balance momentraily. In order to keep the ionic balance, an equal number of `Cl^(-)` pass into the erythrocyes from plasma. The process is known as

Options

A. Hamburger phenomenon
B. bicarbonate shift
C. carbonation
D. Bohr's effect.

Explanation

### Step-by-Step Solution:

1. **Understanding CO2 Transport**:
- During the transport of carbon dioxide (CO2) in the blood, a significant portion (about 70%) is converted into bicarbonate ions (HCO3^-) within red blood cells (erythrocytes).

2. **Formation of Bicarbonate**:
- The conversion of CO2 to bicarbonate is facilitated by an enzyme called carbonic anhydrase. When CO2 enters the erythrocytes, it reacts with water to form carbonic acid (H2CO3), which quickly dissociates into bicarbonate (HCO3^-) and hydrogen ions (H+).

3. **Diffusion of Bicarbonate**:
- The bicarbonate ions (HCO3^-) then diffuse out of the erythrocytes into the plasma. This movement causes a temporary imbalance in ionic concentration because the erythrocytes lose negatively charged bicarbonate ions.

4. **Maintaining Ionic Balance**:
- To maintain the ionic balance after the loss of bicarbonate ions, chloride ions (Cl^-) from the plasma diffuse into the erythrocytes. This exchange of ions is crucial for maintaining electrical neutrality within the cells.

5. **Chloride Shift**:
- The process of chloride ions moving into the erythrocytes in response to the loss of bicarbonate ions is known as the "chloride shift." This phenomenon is also referred to as the "Hamburger phenomenon."

6. **Conclusion**:
- Therefore, the answer to the question is that the process described is known as the **chloride shift** or **Hamburger phenomenon**.