At the base of each antenna of cockroach there is a small whitish spot. It is called 

Options

A. Fenestra
B. Ocellar spot
C. Simple eye
D. All

Answer

To answer the question regarding the small whitish spot at the base of each antenna of a cockroach, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Structure**: The question asks about a specific structure located at the base of each antenna of a cockroach.

2. **Recognize the Name**: This small whitish spot is known as the "simple eye."

3. **Alternative Names**: The simple eye is also referred to by other names such as "fenestra" and "ocellar spot."

4. **Conclusion**: Therefore, the correct answer to the question is that the small whitish spot at the base of each antenna of a cockroach is called the simple eye, which can also be referred to as the fenestra or ocellar spot.

5. **Final Answer**: The correct option is all of the above (simple eye, fenestra, ocellar spot).