Osphradium of Pila is meant for

Options

A. Excretion
B. Nutrition
C. Grinding of food
D. Selection and rejectionof food

Explanation

To answer the question about the function of the Osphradium in Pila, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Osphradium**:
- The Osphradium is an organ found in certain molluscs, including Pila. It is primarily recognized as an olfactory organ.

2. **Function of Osphradium**:
- The Osphradium serves as a chemoreceptor. This means it is involved in detecting chemical substances in the water, which is crucial for the organism's interaction with its environment.

3. **Location of Osphradium**:
- The Osphradium is located near the respiratory opening (or the inhalant siphon) in these organisms. This strategic location allows it to sample the water that is being drawn in for respiration.

4. **Role in Feeding**:
- As water passes over the Osphradium, it helps in identifying potential food particles. The organ plays a critical role in the selection and rejection of food by detecting suitable food items in the water.

5. **Eliminating Incorrect Options**:
- The options provided were excretion, nutrition, grinding of food, and selection and rejection of food.
- Excretion is not related to the Osphradium, as it does not function in waste removal.
- Nutrition is a broader term that does not specifically describe the role of the Osphradium.
- Grinding of food is a mechanical process that does not involve the Osphradium.
- Therefore, the correct function of the Osphradium is the selection and rejection of food.

6. **Conclusion**:
- Based on the above points, the correct answer to the question is that the Osphradium of Pila is meant for the selection and rejection of food.

### Final Answer:
The Osphradium of Pila is meant for the selection and rejection of food.