**Filtration: The Process of Separating Paneer from Curdled Milk**

**Introduction**
When milk curdles, it undergoes a process called coagulation, where the milk proteins clump together and form solid masses. In the case of paneer, the curdling is intentionally induced using a coagulant such as lemon juice or vinegar. Once the milk has curdled, the next step is to separate the solid paneer from the liquid whey.

**Filtration as the Correct Answer**
The correct answer to the question is option 'B' - Filtration. Filtration is the process by which solid particles are separated from a liquid or gas by passing it through a filter medium. In the case of paneer, filtration is used to separate the solid paneer from the liquid whey.

**Explanation**
Here is a detailed explanation of why filtration is the correct answer:

1. Filtration Process: Filtration involves using a porous barrier, called a filter, to separate solids from liquids or gases. In the case of paneer, a fine mesh cloth or cheesecloth is used as the filter. The curdled milk is poured onto the cloth, and the liquid whey drains out through the small openings in the cloth, while the solid paneer remains on top.

2. Separation of Solids and Liquids: The purpose of filtration is to separate solid particles from a liquid or gas. In the case of paneer, the curdled milk contains solid particles of coagulated milk proteins, while the liquid whey contains water and other dissolved substances. Filtration allows the solid paneer to be retained on the filter, while the liquid whey passes through.

3. Advantages of Filtration: Filtration is a commonly used method for separating solids from liquids or gases. It is a simple and effective process that does not require complex equipment. Filtration can be used to separate a wide range of particle sizes, making it suitable for separating the relatively large particles of paneer from the liquid whey.

4. Other Options Explained:
a) Condensation: Condensation is the process of converting a gas or vapor into a liquid state. It does not apply to the separation of paneer from curdled milk.
c) Evaporation: Evaporation is the process of converting a liquid into a gas or vapor. While evaporation may be used to remove moisture from paneer or whey, it does not involve the separation of paneer from curdled milk.
d) Sedimentation: Sedimentation is the process of allowing solid particles to settle at the bottom of a liquid. While sedimentation may occur during the curdling process, it does not involve the separation of paneer from curdled milk.

**Conclusion**
In conclusion, the correct answer to the question is option 'B' - Filtration. Filtration is the process used to separate solid paneer from liquid whey in curdled milk. It involves passing the curdled milk through a filter medium, such as a fine mesh cloth, to retain the solid paneer while allowing the liquid whey to drain out.

By filtration only one can separate the paneer(solid substance) from the curdled milk..